OSA Browser

Glossary of OSA attributes

This Glossary alphabetically lists all attributes used in the OSAv20230621 database(s) held in the OSA. If you would like to have more information about the schema tables please use the OSAv20230621 Schema Browser (other Browser versions).

A B C D E F G H I J K L M
N O P Q R S T U V W X Y Z

U

Name Schema Table Database Description Type Length Unit Default Value Unified Content Descriptor

u1 hipparcos_new_reduction GAIADR1 Upper-triangular weight matric element 1 float 8 stat.weight

u10 hipparcos_new_reduction GAIADR1 Upper-triangular weight matric element 10 float 8 stat.weight

u11 hipparcos_new_reduction GAIADR1 Upper-triangular weight matric element 11 float 8 stat.weight

u12 hipparcos_new_reduction GAIADR1 Upper-triangular weight matric element 12 float 8 stat.weight

u13 hipparcos_new_reduction GAIADR1 Upper-triangular weight matric element 13 float 8 stat.weight

u14 hipparcos_new_reduction GAIADR1 Upper-triangular weight matric element 14 float 8 stat.weight

u15 hipparcos_new_reduction GAIADR1 Upper-triangular weight matric element 15 float 8 stat.weight

u2 hipparcos_new_reduction GAIADR1 Upper-triangular weight matric element 2 float 8 stat.weight

u3 hipparcos_new_reduction GAIADR1 Upper-triangular weight matric element 3 float 8 stat.weight

u4 hipparcos_new_reduction GAIADR1 Upper-triangular weight matric element 4 float 8 stat.weight

u5 hipparcos_new_reduction GAIADR1 Upper-triangular weight matric element 5 float 8 stat.weight

u6 hipparcos_new_reduction GAIADR1 Upper-triangular weight matric element 6 float 8 stat.weight

u7 hipparcos_new_reduction GAIADR1 Upper-triangular weight matric element 7 float 8 stat.weight

u8 hipparcos_new_reduction GAIADR1 Upper-triangular weight matric element 8 float 8 stat.weight

u9 hipparcos_new_reduction GAIADR1 Upper-triangular weight matric element 9 float 8 stat.weight

u_chAperMag3 atlasSource ATLASv20160425 Default point source U_Ch aperture corrected mag (2.0 arcsec aperture diameter)
If in doubt use this flux estimator real 4 mag -0.9999995e9 phot.mag

u_chAperMag3Err atlasSource ATLASv20160425 Error in default point/extended source U_Ch mag (2.0 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error;phot.mag

u_chAperMag4 atlasSource ATLASv20160425 Point source U_Ch aperture corrected mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag

u_chAperMag4Err atlasSource ATLASv20160425 Error in point/extended source U_Ch mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error;phot.mag

u_chAperMag6 atlasSource ATLASv20160425 Point source U_Ch aperture corrected mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag

u_chAperMag6Err atlasSource ATLASv20160425 Error in point/extended source U_Ch mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error;phot.mag

u_chAperMagNoAperCorr3 atlasSource ATLASv20160425 Default extended source U_Ch aperture mag (2.0 arcsec aperture diameter)
If in doubt use this flux estimator real 4 mag -0.9999995e9 phot.mag

u_chAperMagNoAperCorr4 atlasSource ATLASv20160425 Extended source U_Ch aperture mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag

u_chAperMagNoAperCorr6 atlasSource ATLASv20160425 Extended source U_Ch aperture mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag

u_chAverageConf atlasSource ATLASv20160425 average confidence in 2 arcsec diameter default aperture (aper3) U_Ch real 4 -99999999 stat.likelihood

u_chClass atlasSource ATLASv20160425 discrete image classification flag in U_Ch smallint 2 -9999 src.class

u_chClassStat atlasSource ATLASv20160425 N(0,1) stellarness-of-profile statistic in U_Ch real 4 -0.9999995e9 stat

u_chEll atlasSource ATLASv20160425 1-b/a, where a/b=semi-major/minor axes in U_Ch real 4 -0.9999995e9 src.ellipticity

u_cheNum atlasMergeLog ATLASv20160425 the extension number of this U_Ch frame tinyint 1 meta.number

u_chErrBits atlasSource ATLASv20160425 processing warning/error bitwise flags in U_Ch int 4 -99999999 meta.code

Apparently not actually an error bit flag, but a count of the number of zero confidence pixels in the default (2 arcsec diameter) aperture.

u_chEta atlasSource ATLASv20160425 Offset of U_Ch detection from master position (+north/-south) real 4 arcsec -0.9999995e9 pos.eq.dec;arith.diff

When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 1.0 arcseconds is used. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the VHS, you might wish to insist that the offsets in the selected sample are all below 0.5 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want. NB: the master position is the position of the detection in the shortest passband in the set, rather than the ra/dec of the source as stored in source attributes of the same name. The former is used in the pairing process, while the latter is generally the optimally weighted mean position from an astrometric solution or other combinatorial process of all individual detection positions across the available passbands.

u_chGausig atlasSource ATLASv20160425 RMS of axes of ellipse fit in U_Ch real 4 pixels -0.9999995e9 src.morph.param

u_chHlCorSMjRadAs atlasSource ATLASv20160425 Seeing corrected half-light, semi-major axis in U_Ch band real 4 arcsec -0.9999995e9 phys.angSize

u_chmfID atlasMergeLog ATLASv20160425 the UID of the relevant U_Ch multiframe bigint 8 meta.id;obs.field

u_chmgExt atlasSource ATLASv20160425 Extended source colour U_Ch-G (using aperMagNoAperCorr3) real 4 mag -0.9999995e9 phot.color;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

u_chmgExtErr atlasSource ATLASv20160425 Error on extended source colour U_Ch-G real 4 mag -0.9999995e9 stat.error;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

u_chmgPnt atlasSource ATLASv20160425 Point source colour U_Ch-G (using aperMag3) real 4 mag -0.9999995e9 phot.color;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

u_chmgPntErr atlasSource ATLASv20160425 Error on point source colour U_Ch-G real 4 mag -0.9999995e9 stat.error;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

u_chMjd atlasSource ATLASv20160425 The mean Modified Julian Day of each detection float 8 day -0.9999995e9 time.epoch

u_chPA atlasSource ATLASv20160425 ellipse fit celestial orientation in U_Ch real 4 Degrees -0.9999995e9 pos.posAng

u_chPetroMag atlasSource ATLASv20160425 Extended source U_Ch mag (Petrosian) real 4 mag -0.9999995e9 phot.mag

u_chPetroMagErr atlasSource ATLASv20160425 Error in extended source U_Ch mag (Petrosian) real 4 mag -0.9999995e9 stat.error;phot.mag

u_chppErrBits atlasSource ATLASv20160425 additional WFAU post-processing error bits in U_Ch int 4 0 meta.code

Post-processing error quality bit flags assigned to detections in the archive curation procedure for survey data. From least to most significant byte in the 4-byte integer attribute byte 0 (bits 0 to 7) corresponds to information on generally innocuous conditions that are nonetheless potentially significant as regards the integrity of that detection; byte 1 (bits 8 to 15) corresponds to warnings; byte 2 (bits 16 to 23) corresponds to important warnings; and finally byte 3 (bits 24 to 31) corresponds to severe warnings:

Byte Bit Detection quality issue Threshold or bit mask Applies to

Decimal Hexadecimal

0 4 Deblended 16 0x00000010 All VDFS catalogues

0 6 Bad pixel(s) in default aperture 64 0x00000040 All VDFS catalogues

0 7 Low confidence in default aperture 128 0x00000080 All VDFS catalogues

1 12 Lies within detector 16 region of a tile 4096 0x00001000 All catalogues from tiles

2 16 Close to saturated 65536 0x00010000 All VDFS catalogues

2 17 Photometric calibration probably subject to systematic error 131072 0x00020000 VVV only

2 22 Lies within a dither offset of the stacked frame boundary 4194304 0x00400000 All catalogues

2 23 Lies within the underexposed strip (or "ear") of a tile 8388608 0x00800000 All catalogues from tiles

3 24 Lies within an underexposed region of a tile due to missing detector 16777216 0x01000000 All catalogues from tiles

In this way, the higher the error quality bit flag value, the more likely it is that the detection is spurious. The decimal threshold (column 4) gives the minimum value of the quality flag for a detection having the given condition (since other bits in the flag may be set also; the corresponding hexadecimal value, where each digit corresponds to 4 bits in the flag, can be easier to compute when writing SQL queries to test for a given condition). For example, to exclude all Ks band sources in the VHS having any error quality condition other than informational ones, include a predicate ... AND kppErrBits ≤ 255. See the SQL Cookbook and other online pages for further information.

u_chPsfMag atlasSource ATLASv20160425 Point source profile-fitted U_Ch mag real 4 mag -0.9999995e9 phot.mag

u_chPsfMagErr atlasSource ATLASv20160425 Error in point source profile-fitted U_Ch mag real 4 mag -0.9999995e9 stat.error;phot.mag

u_chSeqNum atlasSource ATLASv20160425 the running number of the U_Ch detection int 4 -99999999 meta.number

u_chSerMag2D atlasSource ATLASv20160425 Extended source U_Ch mag (profile-fitted) real 4 mag -0.9999995e9 phot.mag

u_chSerMag2DErr atlasSource ATLASv20160425 Error in extended source U_Ch mag (profile-fitted) real 4 mag -0.9999995e9 stat.error;phot.mag

u_chXi atlasSource ATLASv20160425 Offset of U_Ch detection from master position (+east/-west) real 4 arcsec -0.9999995e9 pos.eq.ra;arith.diff

When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 1.0 arcseconds is used. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the VHS, you might wish to insist that the offsets in the selected sample are all below 0.5 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want. NB: the master position is the position of the detection in the shortest passband in the set, rather than the ra/dec of the source as stored in source attributes of the same name. The former is used in the pairing process, while the latter is generally the optimally weighted mean position from an astrometric solution or other combinatorial process of all individual detection positions across the available passbands.

uAperMag3 atlasSource ATLASDR1 Default point source U aperture corrected mag (2.0 arcsec aperture diameter)
If in doubt use this flux estimator real 4 mag -0.9999995e9 phot.mag

uAperMag3 atlasSource ATLASDR2 Default point source U aperture corrected mag (2.0 arcsec aperture diameter)
If in doubt use this flux estimator real 4 mag -0.9999995e9 phot.mag

uAperMag3 atlasSource ATLASDR3 Default point source U aperture corrected mag (2.0 arcsec aperture diameter)
If in doubt use this flux estimator real 4 mag -0.9999995e9 phot.mag;em.opt.U

uAperMag3 atlasSource ATLASDR4 Default point source U aperture corrected mag (2.0 arcsec aperture diameter)
If in doubt use this flux estimator real 4 mag -0.9999995e9 phot.mag;em.opt.U

uAperMag3 atlasSource ATLASDR5 Default point source U aperture corrected mag (2.0 arcsec aperture diameter)
If in doubt use this flux estimator real 4 mag -0.9999995e9 phot.mag;em.opt.U

uAperMag3 atlasSource ATLASv20131127 Default point source U aperture corrected mag (2.0 arcsec aperture diameter)
If in doubt use this flux estimator real 4 mag -0.9999995e9 phot.mag

uAperMag3 atlasSource ATLASv20160425 Default point source U aperture corrected mag (2.0 arcsec aperture diameter)
If in doubt use this flux estimator real 4 mag -0.9999995e9 phot.mag;em.opt.U

uAperMag3 atlasSource ATLASv20180209 Default point source U aperture corrected mag (2.0 arcsec aperture diameter)
If in doubt use this flux estimator real 4 mag -0.9999995e9 phot.mag;em.opt.U

uAperMag3 vphasSource VPHASDR3 Default point source U aperture corrected mag (2.0 arcsec aperture diameter)
If in doubt use this flux estimator real 4 mag -0.9999995e9 phot.mag;em.opt.U

uAperMag3 vphasSource VPHASv20160112 Default point source U aperture corrected mag (2.0 arcsec aperture diameter)
If in doubt use this flux estimator real 4 mag -0.9999995e9 phot.mag;em.opt.U

uAperMag3 vphasSource VPHASv20170222 Default point source U aperture corrected mag (2.0 arcsec aperture diameter)
If in doubt use this flux estimator real 4 mag -0.9999995e9 phot.mag;em.opt.U

uAperMag3Err atlasSource ATLASDR1 Error in default point/extended source U mag (2.0 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error

uAperMag3Err atlasSource ATLASDR2 Error in default point/extended source U mag (2.0 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error

uAperMag3Err atlasSource ATLASDR3 Error in default point/extended source U mag (2.0 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error;phot.mag;em.opt.U

uAperMag3Err atlasSource ATLASDR4 Error in default point/extended source U mag (2.0 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error;phot.mag;em.opt.U

uAperMag3Err atlasSource ATLASDR5 Error in default point/extended source U mag (2.0 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error;phot.mag;em.opt.U

uAperMag3Err atlasSource ATLASv20131127 Error in default point/extended source U mag (2.0 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error

uAperMag3Err atlasSource ATLASv20160425 Error in default point/extended source U mag (2.0 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error;phot.mag;em.opt.U

uAperMag3Err atlasSource ATLASv20180209 Error in default point/extended source U mag (2.0 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error;phot.mag;em.opt.U

uAperMag3Err vphasSource VPHASDR3 Error in default point/extended source U mag (2.0 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error;phot.mag;em.opt.U

uAperMag3Err vphasSource VPHASv20160112 Error in default point/extended source U mag (2.0 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error;phot.mag;em.opt.U

uAperMag3Err vphasSource VPHASv20170222 Error in default point/extended source U mag (2.0 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error;phot.mag;em.opt.U

uAperMag4 atlasSource ATLASDR1 Point source U aperture corrected mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag

uAperMag4 atlasSource ATLASDR2 Point source U aperture corrected mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag

uAperMag4 atlasSource ATLASDR3 Point source U aperture corrected mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag;em.opt.U

uAperMag4 atlasSource ATLASDR4 Point source U aperture corrected mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag;em.opt.U

uAperMag4 atlasSource ATLASDR5 Point source U aperture corrected mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag;em.opt.U

uAperMag4 atlasSource ATLASv20131127 Point source U aperture corrected mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag

uAperMag4 atlasSource ATLASv20160425 Point source U aperture corrected mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag;em.opt.U

uAperMag4 atlasSource ATLASv20180209 Point source U aperture corrected mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag;em.opt.U

uAperMag4 vphasSource VPHASDR3 Point source U aperture corrected mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag;em.opt.U

uAperMag4 vphasSource VPHASv20160112 Point source U aperture corrected mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag;em.opt.U

uAperMag4 vphasSource VPHASv20170222 Point source U aperture corrected mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag;em.opt.U

uAperMag4Err atlasSource ATLASDR1 Error in point/extended source U mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error

uAperMag4Err atlasSource ATLASDR2 Error in point/extended source U mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error

uAperMag4Err atlasSource ATLASDR3 Error in point/extended source U mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error;phot.mag;em.opt.U

uAperMag4Err atlasSource ATLASDR4 Error in point/extended source U mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error;phot.mag;em.opt.U

uAperMag4Err atlasSource ATLASDR5 Error in point/extended source U mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error;phot.mag;em.opt.U

uAperMag4Err atlasSource ATLASv20131127 Error in point/extended source U mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error

uAperMag4Err atlasSource ATLASv20160425 Error in point/extended source U mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error;phot.mag;em.opt.U

uAperMag4Err atlasSource ATLASv20180209 Error in point/extended source U mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error;phot.mag;em.opt.U

uAperMag4Err vphasSource VPHASDR3 Error in point/extended source U mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error;phot.mag;em.opt.U

uAperMag4Err vphasSource VPHASv20160112 Error in point/extended source U mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error;phot.mag;em.opt.U

uAperMag4Err vphasSource VPHASv20170222 Error in point/extended source U mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error;phot.mag;em.opt.U

uAperMag6 atlasSource ATLASDR1 Point source U aperture corrected mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag

uAperMag6 atlasSource ATLASDR2 Point source U aperture corrected mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag

uAperMag6 atlasSource ATLASDR3 Point source U aperture corrected mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag;em.opt.U

uAperMag6 atlasSource ATLASDR4 Point source U aperture corrected mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag;em.opt.U

uAperMag6 atlasSource ATLASDR5 Point source U aperture corrected mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag;em.opt.U

uAperMag6 atlasSource ATLASv20131127 Point source U aperture corrected mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag

uAperMag6 atlasSource ATLASv20160425 Point source U aperture corrected mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag;em.opt.U

uAperMag6 atlasSource ATLASv20180209 Point source U aperture corrected mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag;em.opt.U

uAperMag6 vphasSource VPHASDR3 Point source U aperture corrected mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag;em.opt.U

uAperMag6 vphasSource VPHASv20160112 Point source U aperture corrected mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag;em.opt.U

uAperMag6 vphasSource VPHASv20170222 Point source U aperture corrected mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag;em.opt.U

uAperMag6Err atlasSource ATLASDR1 Error in point/extended source U mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error

uAperMag6Err atlasSource ATLASDR2 Error in point/extended source U mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error

uAperMag6Err atlasSource ATLASDR3 Error in point/extended source U mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error;phot.mag;em.opt.U

uAperMag6Err atlasSource ATLASDR4 Error in point/extended source U mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error;phot.mag;em.opt.U

uAperMag6Err atlasSource ATLASDR5 Error in point/extended source U mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error;phot.mag;em.opt.U

uAperMag6Err atlasSource ATLASv20131127 Error in point/extended source U mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error

uAperMag6Err atlasSource ATLASv20160425 Error in point/extended source U mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error;phot.mag;em.opt.U

uAperMag6Err atlasSource ATLASv20180209 Error in point/extended source U mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error;phot.mag;em.opt.U

uAperMag6Err vphasSource VPHASDR3 Error in point/extended source U mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error;phot.mag;em.opt.U

uAperMag6Err vphasSource VPHASv20160112 Error in point/extended source U mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error;phot.mag;em.opt.U

uAperMag6Err vphasSource VPHASv20170222 Error in point/extended source U mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error;phot.mag;em.opt.U

uAperMagNoAperCorr3 atlasSource ATLASDR1 Default extended source U aperture mag (2.0 arcsec aperture diameter)
If in doubt use this flux estimator real 4 mag -0.9999995e9 phot.mag

uAperMagNoAperCorr3 atlasSource ATLASDR2 Default extended source U aperture mag (2.0 arcsec aperture diameter)
If in doubt use this flux estimator real 4 mag -0.9999995e9 phot.mag

uAperMagNoAperCorr3 atlasSource ATLASDR3 Default extended source U aperture mag (2.0 arcsec aperture diameter)
If in doubt use this flux estimator real 4 mag -0.9999995e9 phot.mag;em.opt.U

uAperMagNoAperCorr3 atlasSource ATLASDR4 Default extended source U aperture mag (2.0 arcsec aperture diameter)
If in doubt use this flux estimator real 4 mag -0.9999995e9 phot.mag;em.opt.U

uAperMagNoAperCorr3 atlasSource ATLASDR5 Default extended source U aperture mag (2.0 arcsec aperture diameter)
If in doubt use this flux estimator real 4 mag -0.9999995e9 phot.mag;em.opt.U

uAperMagNoAperCorr3 atlasSource ATLASv20131127 Default extended source U aperture mag (2.0 arcsec aperture diameter)
If in doubt use this flux estimator real 4 mag -0.9999995e9 phot.mag

uAperMagNoAperCorr3 atlasSource ATLASv20160425 Default extended source U aperture mag (2.0 arcsec aperture diameter)
If in doubt use this flux estimator real 4 mag -0.9999995e9 phot.mag;em.opt.U

uAperMagNoAperCorr3 atlasSource ATLASv20180209 Default extended source U aperture mag (2.0 arcsec aperture diameter)
If in doubt use this flux estimator real 4 mag -0.9999995e9 phot.mag;em.opt.U

uAperMagNoAperCorr3 vphasSource VPHASDR3 Default extended source U aperture mag (2.0 arcsec aperture diameter)
If in doubt use this flux estimator real 4 mag -0.9999995e9 phot.mag;em.opt.U

uAperMagNoAperCorr3 vphasSource VPHASv20160112 Default extended source U aperture mag (2.0 arcsec aperture diameter)
If in doubt use this flux estimator real 4 mag -0.9999995e9 phot.mag;em.opt.U

uAperMagNoAperCorr3 vphasSource VPHASv20170222 Default extended source U aperture mag (2.0 arcsec aperture diameter)
If in doubt use this flux estimator real 4 mag -0.9999995e9 phot.mag;em.opt.U

uAperMagNoAperCorr4 atlasSource ATLASDR1 Extended source U aperture mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag

uAperMagNoAperCorr4 atlasSource ATLASDR2 Extended source U aperture mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag

uAperMagNoAperCorr4 atlasSource ATLASDR3 Extended source U aperture mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag;em.opt.U

uAperMagNoAperCorr4 atlasSource ATLASDR4 Extended source U aperture mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag;em.opt.U

uAperMagNoAperCorr4 atlasSource ATLASDR5 Extended source U aperture mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag;em.opt.U

uAperMagNoAperCorr4 atlasSource ATLASv20131127 Extended source U aperture mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag

uAperMagNoAperCorr4 atlasSource ATLASv20160425 Extended source U aperture mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag;em.opt.U

uAperMagNoAperCorr4 atlasSource ATLASv20180209 Extended source U aperture mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag;em.opt.U

uAperMagNoAperCorr4 vphasSource VPHASDR3 Extended source U aperture mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag;em.opt.U

uAperMagNoAperCorr4 vphasSource VPHASv20160112 Extended source U aperture mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag;em.opt.U

uAperMagNoAperCorr4 vphasSource VPHASv20170222 Extended source U aperture mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag;em.opt.U

uAperMagNoAperCorr6 atlasSource ATLASDR1 Extended source U aperture mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag

uAperMagNoAperCorr6 atlasSource ATLASDR2 Extended source U aperture mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag

uAperMagNoAperCorr6 atlasSource ATLASDR3 Extended source U aperture mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag;em.opt.U

uAperMagNoAperCorr6 atlasSource ATLASDR4 Extended source U aperture mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag;em.opt.U

uAperMagNoAperCorr6 atlasSource ATLASDR5 Extended source U aperture mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag;em.opt.U

uAperMagNoAperCorr6 atlasSource ATLASv20131127 Extended source U aperture mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag

uAperMagNoAperCorr6 atlasSource ATLASv20160425 Extended source U aperture mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag;em.opt.U

uAperMagNoAperCorr6 atlasSource ATLASv20180209 Extended source U aperture mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag;em.opt.U

uAperMagNoAperCorr6 vphasSource VPHASDR3 Extended source U aperture mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag;em.opt.U

uAperMagNoAperCorr6 vphasSource VPHASv20160112 Extended source U aperture mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag;em.opt.U

uAperMagNoAperCorr6 vphasSource VPHASv20170222 Extended source U aperture mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag;em.opt.U

uAverageConf atlasSource ATLASDR1 average confidence in 2 arcsec diameter default aperture (aper3) U real 4 -99999999 meta.code

uAverageConf atlasSource ATLASDR2 average confidence in 2 arcsec diameter default aperture (aper3) U real 4 -99999999 meta.code

uAverageConf atlasSource ATLASDR3 average confidence in 2 arcsec diameter default aperture (aper3) U real 4 -99999999 stat.likelihood;em.opt.U

uAverageConf atlasSource ATLASDR4 average confidence in 2 arcsec diameter default aperture (aper3) U real 4 -99999999 stat.likelihood;em.opt.U

uAverageConf atlasSource ATLASDR5 average confidence in 2 arcsec diameter default aperture (aper3) U real 4 -99999999 stat.likelihood;em.opt.U

uAverageConf atlasSource ATLASv20131127 average confidence in 2 arcsec diameter default aperture (aper3) U real 4 -99999999 meta.code

uAverageConf atlasSource ATLASv20160425 average confidence in 2 arcsec diameter default aperture (aper3) U real 4 -99999999 stat.likelihood;em.opt.U

uAverageConf atlasSource ATLASv20180209 average confidence in 2 arcsec diameter default aperture (aper3) U real 4 -99999999 stat.likelihood;em.opt.U

uAverageConf vphasSource VPHASDR3 average confidence in 2 arcsec diameter default aperture (aper3) U real 4 -99999999 stat.likelihood;em.opt.U

uAverageConf vphasSource VPHASv20160112 average confidence in 2 arcsec diameter default aperture (aper3) U real 4 -99999999 stat.likelihood;em.opt.U

uAverageConf vphasSource VPHASv20170222 average confidence in 2 arcsec diameter default aperture (aper3) U real 4 -99999999 stat.likelihood;em.opt.U

uClass atlasSource ATLASDR1 discrete image classification flag in U smallint 2 -9999 src.class

uClass atlasSource ATLASDR2 discrete image classification flag in U smallint 2 -9999 src.class

uClass atlasSource ATLASDR3 discrete image classification flag in U smallint 2 -9999 src.class;em.opt.U

uClass atlasSource ATLASDR4 discrete image classification flag in U smallint 2 -9999 src.class;em.opt.U

uClass atlasSource ATLASDR5 discrete image classification flag in U smallint 2 -9999 src.class;em.opt.U

uClass atlasSource ATLASv20131127 discrete image classification flag in U smallint 2 -9999 src.class

uClass atlasSource ATLASv20160425 discrete image classification flag in U smallint 2 -9999 src.class;em.opt.U

uClass atlasSource ATLASv20180209 discrete image classification flag in U smallint 2 -9999 src.class;em.opt.U

uClass vphasSource VPHASDR3 discrete image classification flag in U smallint 2 -9999 src.class;em.opt.U

uClass vphasSource VPHASv20160112 discrete image classification flag in U smallint 2 -9999 src.class;em.opt.U

uClass vphasSource VPHASv20170222 discrete image classification flag in U smallint 2 -9999 src.class;em.opt.U

uClassStat atlasSource ATLASDR1 N(0,1) stellarness-of-profile statistic in U real 4 -0.9999995e9 stat

uClassStat atlasSource ATLASDR2 N(0,1) stellarness-of-profile statistic in U real 4 -0.9999995e9 stat

uClassStat atlasSource ATLASDR3 N(0,1) stellarness-of-profile statistic in U real 4 -0.9999995e9 stat;em.opt.U

uClassStat atlasSource ATLASDR4 N(0,1) stellarness-of-profile statistic in U real 4 -0.9999995e9 stat;em.opt.U

uClassStat atlasSource ATLASDR5 N(0,1) stellarness-of-profile statistic in U real 4 -0.9999995e9 stat;em.opt.U

uClassStat atlasSource ATLASv20131127 N(0,1) stellarness-of-profile statistic in U real 4 -0.9999995e9 stat

uClassStat atlasSource ATLASv20160425 N(0,1) stellarness-of-profile statistic in U real 4 -0.9999995e9 stat;em.opt.U

uClassStat atlasSource ATLASv20180209 N(0,1) stellarness-of-profile statistic in U real 4 -0.9999995e9 stat;em.opt.U

uClassStat vphasSource VPHASDR3 N(0,1) stellarness-of-profile statistic in U real 4 -0.9999995e9 stat;em.opt.U

uClassStat vphasSource VPHASv20160112 N(0,1) stellarness-of-profile statistic in U real 4 -0.9999995e9 stat;em.opt.U

uClassStat vphasSource VPHASv20170222 N(0,1) stellarness-of-profile statistic in U real 4 -0.9999995e9 stat;em.opt.U

uEll atlasSource ATLASDR1 1-b/a, where a/b=semi-major/minor axes in U real 4 -0.9999995e9 src.ellipticity

uEll atlasSource ATLASDR2 1-b/a, where a/b=semi-major/minor axes in U real 4 -0.9999995e9 src.ellipticity

uEll atlasSource ATLASDR3 1-b/a, where a/b=semi-major/minor axes in U real 4 -0.9999995e9 src.ellipticity;em.opt.U

uEll atlasSource ATLASDR4 1-b/a, where a/b=semi-major/minor axes in U real 4 -0.9999995e9 src.ellipticity;em.opt.U

uEll atlasSource ATLASDR5 1-b/a, where a/b=semi-major/minor axes in U real 4 -0.9999995e9 src.ellipticity;em.opt.U

uEll atlasSource ATLASv20131127 1-b/a, where a/b=semi-major/minor axes in U real 4 -0.9999995e9 src.ellipticity

uEll atlasSource ATLASv20160425 1-b/a, where a/b=semi-major/minor axes in U real 4 -0.9999995e9 src.ellipticity;em.opt.U

uEll atlasSource ATLASv20180209 1-b/a, where a/b=semi-major/minor axes in U real 4 -0.9999995e9 src.ellipticity;em.opt.U

uEll vphasSource VPHASDR3 1-b/a, where a/b=semi-major/minor axes in U real 4 -0.9999995e9 src.ellipticity;em.opt.U

uEll vphasSource VPHASv20160112 1-b/a, where a/b=semi-major/minor axes in U real 4 -0.9999995e9 src.ellipticity;em.opt.U

uEll vphasSource VPHASv20170222 1-b/a, where a/b=semi-major/minor axes in U real 4 -0.9999995e9 src.ellipticity;em.opt.U

ueNum atlasMergeLog ATLASDR1 the extension number of this U frame tinyint 1 meta.number

ueNum atlasMergeLog ATLASDR2 the extension number of this U frame tinyint 1 meta.number

ueNum atlasMergeLog ATLASDR3 the extension number of this U frame tinyint 1 meta.number;em.opt.U

ueNum atlasMergeLog ATLASDR4 the extension number of this U frame tinyint 1 meta.number;em.opt.U

ueNum atlasMergeLog ATLASDR5 the extension number of this U frame tinyint 1 meta.id;em.opt.U

ueNum atlasMergeLog ATLASv20131127 the extension number of this U frame tinyint 1 meta.number

ueNum atlasMergeLog ATLASv20160425 the extension number of this U frame tinyint 1 meta.number;em.opt.U

ueNum atlasMergeLog ATLASv20180209 the extension number of this U frame tinyint 1 meta.number;em.opt.U

ueNum vphasMergeLog VPHASDR3 the extension number of this U frame tinyint 1 meta.number;em.opt.U

ueNum vphasMergeLog VPHASv20160112 the extension number of this U frame tinyint 1 meta.number;em.opt.U

ueNum vphasMergeLog VPHASv20170222 the extension number of this U frame tinyint 1 meta.number;em.opt.U

uErrBits atlasSource ATLASDR1 processing warning/error bitwise flags in U int 4 -99999999 meta.code

Apparently not actually an error bit flag, but a count of the number of zero confidence pixels in the default (2 arcsec diameter) aperture.

uErrBits atlasSource ATLASDR2 processing warning/error bitwise flags in U int 4 -99999999 meta.code

Apparently not actually an error bit flag, but a count of the number of zero confidence pixels in the default (2 arcsec diameter) aperture.

uErrBits atlasSource ATLASDR3 processing warning/error bitwise flags in U int 4 -99999999 meta.code;em.opt.U

Apparently not actually an error bit flag, but a count of the number of zero confidence pixels in the default (2 arcsec diameter) aperture.

uErrBits atlasSource ATLASDR4 processing warning/error bitwise flags in U int 4 -99999999 meta.code;em.opt.U

Apparently not actually an error bit flag, but a count of the number of zero confidence pixels in the default (2 arcsec diameter) aperture.

uErrBits atlasSource ATLASDR5 processing warning/error bitwise flags in U int 4 -99999999 meta.code;em.opt.U

Apparently not actually an error bit flag, but a count of the number of zero confidence pixels in the default (2 arcsec diameter) aperture.

uErrBits atlasSource ATLASv20131127 processing warning/error bitwise flags in U int 4 -99999999 meta.code

Apparently not actually an error bit flag, but a count of the number of zero confidence pixels in the default (2 arcsec diameter) aperture.

uErrBits atlasSource ATLASv20160425 processing warning/error bitwise flags in U int 4 -99999999 meta.code;em.opt.U

Apparently not actually an error bit flag, but a count of the number of zero confidence pixels in the default (2 arcsec diameter) aperture.

uErrBits atlasSource ATLASv20180209 processing warning/error bitwise flags in U int 4 -99999999 meta.code;em.opt.U

Apparently not actually an error bit flag, but a count of the number of zero confidence pixels in the default (2 arcsec diameter) aperture.

uErrBits vphasSource VPHASDR3 processing warning/error bitwise flags in U int 4 -99999999 meta.code;em.opt.U

Apparently not actually an error bit flag, but a count of the number of zero confidence pixels in the default (2 arcsec diameter) aperture.

uErrBits vphasSource VPHASv20160112 processing warning/error bitwise flags in U int 4 -99999999 meta.code;em.opt.U

Apparently not actually an error bit flag, but a count of the number of zero confidence pixels in the default (2 arcsec diameter) aperture.

uErrBits vphasSource VPHASv20170222 processing warning/error bitwise flags in U int 4 -99999999 meta.code;em.opt.U

Apparently not actually an error bit flag, but a count of the number of zero confidence pixels in the default (2 arcsec diameter) aperture.

uEta atlasSource ATLASDR1 Offset of U detection from master position (+north/-south) real 4 arcsec -0.9999995e9 pos.eq.dec;arith.diff

When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 1.0 arcseconds is used. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the VHS, you might wish to insist that the offsets in the selected sample are all below 0.5 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want. NB: the master position is the position of the detection in the shortest passband in the set, rather than the ra/dec of the source as stored in source attributes of the same name. The former is used in the pairing process, while the latter is generally the optimally weighted mean position from an astrometric solution or other combinatorial process of all individual detection positions across the available passbands.

uEta atlasSource ATLASDR2 Offset of U detection from master position (+north/-south) real 4 arcsec -0.9999995e9 pos.eq.dec;arith.diff

When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 1.0 arcseconds is used. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the VHS, you might wish to insist that the offsets in the selected sample are all below 0.5 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want. NB: the master position is the position of the detection in the shortest passband in the set, rather than the ra/dec of the source as stored in source attributes of the same name. The former is used in the pairing process, while the latter is generally the optimally weighted mean position from an astrometric solution or other combinatorial process of all individual detection positions across the available passbands.

uEta atlasSource ATLASDR3 Offset of U detection from master position (+north/-south) real 4 arcsec -0.9999995e9 pos.eq.dec;arith.diff;em.opt.U

When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 1.0 arcseconds is used. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the VHS, you might wish to insist that the offsets in the selected sample are all below 0.5 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want. NB: the master position is the position of the detection in the shortest passband in the set, rather than the ra/dec of the source as stored in source attributes of the same name. The former is used in the pairing process, while the latter is generally the optimally weighted mean position from an astrometric solution or other combinatorial process of all individual detection positions across the available passbands.

uEta atlasSource ATLASDR4 Offset of U detection from master position (+north/-south) real 4 arcsec -0.9999995e9 pos.eq.dec;arith.diff;em.opt.U

When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 1.0 arcseconds is used. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the VHS, you might wish to insist that the offsets in the selected sample are all below 0.5 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want. NB: the master position is the position of the detection in the shortest passband in the set, rather than the ra/dec of the source as stored in source attributes of the same name. The former is used in the pairing process, while the latter is generally the optimally weighted mean position from an astrometric solution or other combinatorial process of all individual detection positions across the available passbands.

uEta atlasSource ATLASDR5 Offset of U detection from master position (+north/-south) real 4 arcsec -0.9999995e9 pos.eq.dec;arith.diff;em.opt.U

When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 1.0 arcseconds is used. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the VHS, you might wish to insist that the offsets in the selected sample are all below 0.5 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want. NB: the master position is the position of the detection in the shortest passband in the set, rather than the ra/dec of the source as stored in source attributes of the same name. The former is used in the pairing process, while the latter is generally the optimally weighted mean position from an astrometric solution or other combinatorial process of all individual detection positions across the available passbands.

uEta atlasSource ATLASv20131127 Offset of U detection from master position (+north/-south) real 4 arcsec -0.9999995e9 pos.eq.dec;arith.diff

When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 1.0 arcseconds is used. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the VHS, you might wish to insist that the offsets in the selected sample are all below 0.5 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want. NB: the master position is the position of the detection in the shortest passband in the set, rather than the ra/dec of the source as stored in source attributes of the same name. The former is used in the pairing process, while the latter is generally the optimally weighted mean position from an astrometric solution or other combinatorial process of all individual detection positions across the available passbands.

uEta atlasSource ATLASv20160425 Offset of U detection from master position (+north/-south) real 4 arcsec -0.9999995e9 pos.eq.dec;arith.diff;em.opt.U

When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 1.0 arcseconds is used. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the VHS, you might wish to insist that the offsets in the selected sample are all below 0.5 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want. NB: the master position is the position of the detection in the shortest passband in the set, rather than the ra/dec of the source as stored in source attributes of the same name. The former is used in the pairing process, while the latter is generally the optimally weighted mean position from an astrometric solution or other combinatorial process of all individual detection positions across the available passbands.

uEta atlasSource ATLASv20180209 Offset of U detection from master position (+north/-south) real 4 arcsec -0.9999995e9 pos.eq.dec;arith.diff;em.opt.U

When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 1.0 arcseconds is used. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the VHS, you might wish to insist that the offsets in the selected sample are all below 0.5 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want. NB: the master position is the position of the detection in the shortest passband in the set, rather than the ra/dec of the source as stored in source attributes of the same name. The former is used in the pairing process, while the latter is generally the optimally weighted mean position from an astrometric solution or other combinatorial process of all individual detection positions across the available passbands.

uEta vphasSource VPHASDR3 Offset of U detection from master position (+north/-south) real 4 arcsec -0.9999995e9 pos.eq.dec;arith.diff;em.opt.U

When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 1.0 arcseconds is used. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the VHS, you might wish to insist that the offsets in the selected sample are all below 0.5 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want. NB: the master position is the position of the detection in the shortest passband in the set, rather than the ra/dec of the source as stored in source attributes of the same name. The former is used in the pairing process, while the latter is generally the optimally weighted mean position from an astrometric solution or other combinatorial process of all individual detection positions across the available passbands.

uEta vphasSource VPHASv20160112 Offset of U detection from master position (+north/-south) real 4 arcsec -0.9999995e9 pos.eq.dec;arith.diff;em.opt.U

When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 1.0 arcseconds is used. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the VHS, you might wish to insist that the offsets in the selected sample are all below 0.5 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want. NB: the master position is the position of the detection in the shortest passband in the set, rather than the ra/dec of the source as stored in source attributes of the same name. The former is used in the pairing process, while the latter is generally the optimally weighted mean position from an astrometric solution or other combinatorial process of all individual detection positions across the available passbands.

uEta vphasSource VPHASv20170222 Offset of U detection from master position (+north/-south) real 4 arcsec -0.9999995e9 pos.eq.dec;arith.diff;em.opt.U

When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 1.0 arcseconds is used. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the VHS, you might wish to insist that the offsets in the selected sample are all below 0.5 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want. NB: the master position is the position of the detection in the shortest passband in the set, rather than the ra/dec of the source as stored in source attributes of the same name. The former is used in the pairing process, while the latter is generally the optimally weighted mean position from an astrometric solution or other combinatorial process of all individual detection positions across the available passbands.

uGausig atlasSource ATLASDR1 RMS of axes of ellipse fit in U real 4 pixels -0.9999995e9 src.morph.param

uGausig atlasSource ATLASDR2 RMS of axes of ellipse fit in U real 4 pixels -0.9999995e9 src.morph.param

uGausig atlasSource ATLASDR3 RMS of axes of ellipse fit in U real 4 pixels -0.9999995e9 src.morph.param;em.opt.U

uGausig atlasSource ATLASDR4 RMS of axes of ellipse fit in U real 4 pixels -0.9999995e9 src.morph.param;em.opt.U

uGausig atlasSource ATLASDR5 RMS of axes of ellipse fit in U real 4 pixels -0.9999995e9 src.morph.param;em.opt.U

uGausig atlasSource ATLASv20131127 RMS of axes of ellipse fit in U real 4 pixels -0.9999995e9 src.morph.param

uGausig atlasSource ATLASv20160425 RMS of axes of ellipse fit in U real 4 pixels -0.9999995e9 src.morph.param;em.opt.U

uGausig atlasSource ATLASv20180209 RMS of axes of ellipse fit in U real 4 pixels -0.9999995e9 src.morph.param;em.opt.U

uGausig vphasSource VPHASDR3 RMS of axes of ellipse fit in U real 4 pixels -0.9999995e9 src.morph.param;em.opt.U

uGausig vphasSource VPHASv20160112 RMS of axes of ellipse fit in U real 4 pixels -0.9999995e9 src.morph.param;em.opt.U

uGausig vphasSource VPHASv20170222 RMS of axes of ellipse fit in U real 4 pixels -0.9999995e9 src.morph.param;em.opt.U

uHlCorSMjRadAs atlasSource ATLASDR1 Seeing corrected half-light, semi-major axis in U band real 4 arcsec -0.9999995e9 phys.angSize;src

uHlCorSMjRadAs atlasSource ATLASDR2 Seeing corrected half-light, semi-major axis in U band real 4 arcsec -0.9999995e9 phys.angSize;src

uHlCorSMjRadAs atlasSource ATLASDR3 Seeing corrected half-light, semi-major axis in U band real 4 arcsec -0.9999995e9 phys.angSize;em.opt.U

uHlCorSMjRadAs atlasSource ATLASDR4 Seeing corrected half-light, semi-major axis in U band real 4 arcsec -0.9999995e9 phys.angSize;em.opt.U

uHlCorSMjRadAs atlasSource ATLASDR5 Seeing corrected half-light, semi-major axis in U band real 4 arcsec -0.9999995e9 phys.angSize;em.opt.U

uHlCorSMjRadAs atlasSource ATLASv20131127 Seeing corrected half-light, semi-major axis in U band real 4 arcsec -0.9999995e9 phys.angSize;src

uHlCorSMjRadAs atlasSource ATLASv20160425 Seeing corrected half-light, semi-major axis in U band real 4 arcsec -0.9999995e9 phys.angSize;em.opt.U

uHlCorSMjRadAs atlasSource ATLASv20180209 Seeing corrected half-light, semi-major axis in U band real 4 arcsec -0.9999995e9 phys.angSize;em.opt.U

uKronMag atlasSource ATLASDR4 Extended source U mag (Kron) real 4 mag -0.9999995e9 phot.mag;em.opt.U

uKronMag atlasSource ATLASDR5 Extended source U mag (Kron) real 4 mag -0.9999995e9 phot.mag;em.opt.U

uKronMag atlasSource ATLASv20180209 Extended source U mag (Kron) real 4 mag -0.9999995e9 phot.mag;em.opt.U

uKronMagErr atlasSource ATLASDR4 Error in extended source U mag (Kron) real 4 mag -0.9999995e9 stat.error;phot.mag;em.opt.U

uKronMagErr atlasSource ATLASDR5 Error in extended source U mag (Kron) real 4 mag -0.9999995e9 stat.error;phot.mag;em.opt.U

uKronMagErr atlasSource ATLASv20180209 Error in extended source U mag (Kron) real 4 mag -0.9999995e9 stat.error;phot.mag;em.opt.U

ul_chAperMag3 atlasSource ATLASv20160425 Default point source Ul_Ch aperture corrected mag (2.0 arcsec aperture diameter)
If in doubt use this flux estimator real 4 mag -0.9999995e9 phot.mag

ul_chAperMag3Err atlasSource ATLASv20160425 Error in default point/extended source Ul_Ch mag (2.0 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error;phot.mag

ul_chAperMag4 atlasSource ATLASv20160425 Point source Ul_Ch aperture corrected mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag

ul_chAperMag4Err atlasSource ATLASv20160425 Error in point/extended source Ul_Ch mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error;phot.mag

ul_chAperMag6 atlasSource ATLASv20160425 Point source Ul_Ch aperture corrected mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag

ul_chAperMag6Err atlasSource ATLASv20160425 Error in point/extended source Ul_Ch mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error;phot.mag

ul_chAperMagNoAperCorr3 atlasSource ATLASv20160425 Default extended source Ul_Ch aperture mag (2.0 arcsec aperture diameter)
If in doubt use this flux estimator real 4 mag -0.9999995e9 phot.mag

ul_chAperMagNoAperCorr4 atlasSource ATLASv20160425 Extended source Ul_Ch aperture mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag

ul_chAperMagNoAperCorr6 atlasSource ATLASv20160425 Extended source Ul_Ch aperture mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag

ul_chAverageConf atlasSource ATLASv20160425 average confidence in 2 arcsec diameter default aperture (aper3) Ul_Ch real 4 -99999999 stat.likelihood

ul_chClass atlasSource ATLASv20160425 discrete image classification flag in Ul_Ch smallint 2 -9999 src.class

ul_chClassStat atlasSource ATLASv20160425 N(0,1) stellarness-of-profile statistic in Ul_Ch real 4 -0.9999995e9 stat

ul_chEll atlasSource ATLASv20160425 1-b/a, where a/b=semi-major/minor axes in Ul_Ch real 4 -0.9999995e9 src.ellipticity

ul_cheNum atlasMergeLog ATLASv20160425 the extension number of this Ul_Ch frame tinyint 1 meta.number

ul_chErrBits atlasSource ATLASv20160425 processing warning/error bitwise flags in Ul_Ch int 4 -99999999 meta.code

Apparently not actually an error bit flag, but a count of the number of zero confidence pixels in the default (2 arcsec diameter) aperture.

ul_chEta atlasSource ATLASv20160425 Offset of Ul_Ch detection from master position (+north/-south) real 4 arcsec -0.9999995e9 pos.eq.dec;arith.diff

When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 1.0 arcseconds is used. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the VHS, you might wish to insist that the offsets in the selected sample are all below 0.5 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want. NB: the master position is the position of the detection in the shortest passband in the set, rather than the ra/dec of the source as stored in source attributes of the same name. The former is used in the pairing process, while the latter is generally the optimally weighted mean position from an astrometric solution or other combinatorial process of all individual detection positions across the available passbands.

ul_chGausig atlasSource ATLASv20160425 RMS of axes of ellipse fit in Ul_Ch real 4 pixels -0.9999995e9 src.morph.param

ul_chHlCorSMjRadAs atlasSource ATLASv20160425 Seeing corrected half-light, semi-major axis in Ul_Ch band real 4 arcsec -0.9999995e9 phys.angSize

ul_chmfID atlasMergeLog ATLASv20160425 the UID of the relevant Ul_Ch multiframe bigint 8 meta.id;obs.field

ul_chmgExt atlasSource ATLASv20160425 Extended source colour Ul_Ch-G (using aperMagNoAperCorr3) real 4 mag -0.9999995e9 phot.color;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

ul_chmgExtErr atlasSource ATLASv20160425 Error on extended source colour Ul_Ch-G real 4 mag -0.9999995e9 stat.error;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

ul_chmgPnt atlasSource ATLASv20160425 Point source colour Ul_Ch-G (using aperMag3) real 4 mag -0.9999995e9 phot.color;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

ul_chmgPntErr atlasSource ATLASv20160425 Error on point source colour Ul_Ch-G real 4 mag -0.9999995e9 stat.error;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

ul_chMjd atlasSource ATLASv20160425 The mean Modified Julian Day of each detection float 8 day -0.9999995e9 time.epoch

ul_chPA atlasSource ATLASv20160425 ellipse fit celestial orientation in Ul_Ch real 4 Degrees -0.9999995e9 pos.posAng

ul_chPetroMag atlasSource ATLASv20160425 Extended source Ul_Ch mag (Petrosian) real 4 mag -0.9999995e9 phot.mag

ul_chPetroMagErr atlasSource ATLASv20160425 Error in extended source Ul_Ch mag (Petrosian) real 4 mag -0.9999995e9 stat.error;phot.mag

ul_chppErrBits atlasSource ATLASv20160425 additional WFAU post-processing error bits in Ul_Ch int 4 0 meta.code

Post-processing error quality bit flags assigned to detections in the archive curation procedure for survey data. From least to most significant byte in the 4-byte integer attribute byte 0 (bits 0 to 7) corresponds to information on generally innocuous conditions that are nonetheless potentially significant as regards the integrity of that detection; byte 1 (bits 8 to 15) corresponds to warnings; byte 2 (bits 16 to 23) corresponds to important warnings; and finally byte 3 (bits 24 to 31) corresponds to severe warnings:

Byte Bit Detection quality issue Threshold or bit mask Applies to

Decimal Hexadecimal

0 4 Deblended 16 0x00000010 All VDFS catalogues

0 6 Bad pixel(s) in default aperture 64 0x00000040 All VDFS catalogues

0 7 Low confidence in default aperture 128 0x00000080 All VDFS catalogues

1 12 Lies within detector 16 region of a tile 4096 0x00001000 All catalogues from tiles

2 16 Close to saturated 65536 0x00010000 All VDFS catalogues

2 17 Photometric calibration probably subject to systematic error 131072 0x00020000 VVV only

2 22 Lies within a dither offset of the stacked frame boundary 4194304 0x00400000 All catalogues

2 23 Lies within the underexposed strip (or "ear") of a tile 8388608 0x00800000 All catalogues from tiles

3 24 Lies within an underexposed region of a tile due to missing detector 16777216 0x01000000 All catalogues from tiles

In this way, the higher the error quality bit flag value, the more likely it is that the detection is spurious. The decimal threshold (column 4) gives the minimum value of the quality flag for a detection having the given condition (since other bits in the flag may be set also; the corresponding hexadecimal value, where each digit corresponds to 4 bits in the flag, can be easier to compute when writing SQL queries to test for a given condition). For example, to exclude all Ks band sources in the VHS having any error quality condition other than informational ones, include a predicate ... AND kppErrBits ≤ 255. See the SQL Cookbook and other online pages for further information.

ul_chPsfMag atlasSource ATLASv20160425 Point source profile-fitted Ul_Ch mag real 4 mag -0.9999995e9 phot.mag

ul_chPsfMagErr atlasSource ATLASv20160425 Error in point source profile-fitted Ul_Ch mag real 4 mag -0.9999995e9 stat.error;phot.mag

ul_chSeqNum atlasSource ATLASv20160425 the running number of the Ul_Ch detection int 4 -99999999 meta.number

ul_chSerMag2D atlasSource ATLASv20160425 Extended source Ul_Ch mag (profile-fitted) real 4 mag -0.9999995e9 phot.mag

ul_chSerMag2DErr atlasSource ATLASv20160425 Error in extended source Ul_Ch mag (profile-fitted) real 4 mag -0.9999995e9 stat.error;phot.mag

ul_chXi atlasSource ATLASv20160425 Offset of Ul_Ch detection from master position (+east/-west) real 4 arcsec -0.9999995e9 pos.eq.ra;arith.diff

When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 1.0 arcseconds is used. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the VHS, you might wish to insist that the offsets in the selected sample are all below 0.5 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want. NB: the master position is the position of the detection in the shortest passband in the set, rather than the ra/dec of the source as stored in source attributes of the same name. The former is used in the pairing process, while the latter is generally the optimally weighted mean position from an astrometric solution or other combinatorial process of all individual detection positions across the available passbands.

ulAperMag3 atlasSource ATLASDR2 Default point source Ul aperture corrected mag (2.0 arcsec aperture diameter)
If in doubt use this flux estimator real 4 mag -0.9999995e9 phot.mag

ulAperMag3 atlasSource ATLASDR3 Default point source Ul aperture corrected mag (2.0 arcsec aperture diameter)
If in doubt use this flux estimator real 4 mag -0.9999995e9 phot.mag

ulAperMag3 atlasSource ATLASDR4 Default point source Ul aperture corrected mag (2.0 arcsec aperture diameter)
If in doubt use this flux estimator real 4 mag -0.9999995e9 phot.mag

ulAperMag3 atlasSource ATLASDR5 Default point source Ul aperture corrected mag (2.0 arcsec aperture diameter)
If in doubt use this flux estimator real 4 mag -0.9999995e9 phot.mag

ulAperMag3 atlasSource ATLASv20160425 Default point source Ul aperture corrected mag (2.0 arcsec aperture diameter)
If in doubt use this flux estimator real 4 mag -0.9999995e9 phot.mag

ulAperMag3 atlasSource ATLASv20180209 Default point source Ul aperture corrected mag (2.0 arcsec aperture diameter)
If in doubt use this flux estimator real 4 mag -0.9999995e9 phot.mag

ulAperMag3Err atlasSource ATLASDR2 Error in default point/extended source Ul mag (2.0 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error

ulAperMag3Err atlasSource ATLASDR3 Error in default point/extended source Ul mag (2.0 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error;phot.mag

ulAperMag3Err atlasSource ATLASDR4 Error in default point/extended source Ul mag (2.0 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error;phot.mag

ulAperMag3Err atlasSource ATLASDR5 Error in default point/extended source Ul mag (2.0 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error;phot.mag

ulAperMag3Err atlasSource ATLASv20160425 Error in default point/extended source Ul mag (2.0 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error;phot.mag

ulAperMag3Err atlasSource ATLASv20180209 Error in default point/extended source Ul mag (2.0 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error;phot.mag

ulAperMag4 atlasSource ATLASDR2 Point source Ul aperture corrected mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag

ulAperMag4 atlasSource ATLASDR3 Point source Ul aperture corrected mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag

ulAperMag4 atlasSource ATLASDR4 Point source Ul aperture corrected mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag

ulAperMag4 atlasSource ATLASDR5 Point source Ul aperture corrected mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag

ulAperMag4 atlasSource ATLASv20160425 Point source Ul aperture corrected mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag

ulAperMag4 atlasSource ATLASv20180209 Point source Ul aperture corrected mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag

ulAperMag4Err atlasSource ATLASDR2 Error in point/extended source Ul mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error

ulAperMag4Err atlasSource ATLASDR3 Error in point/extended source Ul mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error;phot.mag

ulAperMag4Err atlasSource ATLASDR4 Error in point/extended source Ul mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error;phot.mag

ulAperMag4Err atlasSource ATLASDR5 Error in point/extended source Ul mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error;phot.mag

ulAperMag4Err atlasSource ATLASv20160425 Error in point/extended source Ul mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error;phot.mag

ulAperMag4Err atlasSource ATLASv20180209 Error in point/extended source Ul mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error;phot.mag

ulAperMag6 atlasSource ATLASDR2 Point source Ul aperture corrected mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag

ulAperMag6 atlasSource ATLASDR3 Point source Ul aperture corrected mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag

ulAperMag6 atlasSource ATLASDR4 Point source Ul aperture corrected mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag

ulAperMag6 atlasSource ATLASDR5 Point source Ul aperture corrected mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag

ulAperMag6 atlasSource ATLASv20160425 Point source Ul aperture corrected mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag

ulAperMag6 atlasSource ATLASv20180209 Point source Ul aperture corrected mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag

ulAperMag6Err atlasSource ATLASDR2 Error in point/extended source Ul mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error

ulAperMag6Err atlasSource ATLASDR3 Error in point/extended source Ul mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error;phot.mag

ulAperMag6Err atlasSource ATLASDR4 Error in point/extended source Ul mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error;phot.mag

ulAperMag6Err atlasSource ATLASDR5 Error in point/extended source Ul mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error;phot.mag

ulAperMag6Err atlasSource ATLASv20160425 Error in point/extended source Ul mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error;phot.mag

ulAperMag6Err atlasSource ATLASv20180209 Error in point/extended source Ul mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 stat.error;phot.mag

ulAperMagNoAperCorr3 atlasSource ATLASDR2 Default extended source Ul aperture mag (2.0 arcsec aperture diameter)
If in doubt use this flux estimator real 4 mag -0.9999995e9 phot.mag

ulAperMagNoAperCorr3 atlasSource ATLASDR3 Default extended source Ul aperture mag (2.0 arcsec aperture diameter)
If in doubt use this flux estimator real 4 mag -0.9999995e9 phot.mag

ulAperMagNoAperCorr3 atlasSource ATLASDR4 Default extended source Ul aperture mag (2.0 arcsec aperture diameter)
If in doubt use this flux estimator real 4 mag -0.9999995e9 phot.mag

ulAperMagNoAperCorr3 atlasSource ATLASDR5 Default extended source Ul aperture mag (2.0 arcsec aperture diameter)
If in doubt use this flux estimator real 4 mag -0.9999995e9 phot.mag

ulAperMagNoAperCorr3 atlasSource ATLASv20160425 Default extended source Ul aperture mag (2.0 arcsec aperture diameter)
If in doubt use this flux estimator real 4 mag -0.9999995e9 phot.mag

ulAperMagNoAperCorr3 atlasSource ATLASv20180209 Default extended source Ul aperture mag (2.0 arcsec aperture diameter)
If in doubt use this flux estimator real 4 mag -0.9999995e9 phot.mag

ulAperMagNoAperCorr4 atlasSource ATLASDR2 Extended source Ul aperture mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag

ulAperMagNoAperCorr4 atlasSource ATLASDR3 Extended source Ul aperture mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag

ulAperMagNoAperCorr4 atlasSource ATLASDR4 Extended source Ul aperture mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag

ulAperMagNoAperCorr4 atlasSource ATLASDR5 Extended source Ul aperture mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag

ulAperMagNoAperCorr4 atlasSource ATLASv20160425 Extended source Ul aperture mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag

ulAperMagNoAperCorr4 atlasSource ATLASv20180209 Extended source Ul aperture mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag

ulAperMagNoAperCorr6 atlasSource ATLASDR2 Extended source Ul aperture mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag

ulAperMagNoAperCorr6 atlasSource ATLASDR3 Extended source Ul aperture mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag

ulAperMagNoAperCorr6 atlasSource ATLASDR4 Extended source Ul aperture mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag

ulAperMagNoAperCorr6 atlasSource ATLASDR5 Extended source Ul aperture mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag

ulAperMagNoAperCorr6 atlasSource ATLASv20160425 Extended source Ul aperture mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag

ulAperMagNoAperCorr6 atlasSource ATLASv20180209 Extended source Ul aperture mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 phot.mag

ulAverageConf atlasSource ATLASDR2 average confidence in 2 arcsec diameter default aperture (aper3) Ul real 4 -99999999 meta.code

ulAverageConf atlasSource ATLASDR3 average confidence in 2 arcsec diameter default aperture (aper3) Ul real 4 -99999999 stat.likelihood

ulAverageConf atlasSource ATLASDR4 average confidence in 2 arcsec diameter default aperture (aper3) Ul real 4 -99999999 stat.likelihood

ulAverageConf atlasSource ATLASDR5 average confidence in 2 arcsec diameter default aperture (aper3) Ul real 4 -99999999 stat.likelihood

ulAverageConf atlasSource ATLASv20160425 average confidence in 2 arcsec diameter default aperture (aper3) Ul real 4 -99999999 stat.likelihood

ulAverageConf atlasSource ATLASv20180209 average confidence in 2 arcsec diameter default aperture (aper3) Ul real 4 -99999999 stat.likelihood

ulClass atlasSource ATLASDR2 discrete image classification flag in Ul smallint 2 -9999 src.class

ulClass atlasSource ATLASDR3 discrete image classification flag in Ul smallint 2 -9999 src.class

ulClass atlasSource ATLASDR4 discrete image classification flag in Ul smallint 2 -9999 src.class

ulClass atlasSource ATLASDR5 discrete image classification flag in Ul smallint 2 -9999 src.class

ulClass atlasSource ATLASv20160425 discrete image classification flag in Ul smallint 2 -9999 src.class

ulClass atlasSource ATLASv20180209 discrete image classification flag in Ul smallint 2 -9999 src.class

ulClassStat atlasSource ATLASDR2 N(0,1) stellarness-of-profile statistic in Ul real 4 -0.9999995e9 stat

ulClassStat atlasSource ATLASDR3 N(0,1) stellarness-of-profile statistic in Ul real 4 -0.9999995e9 stat

ulClassStat atlasSource ATLASDR4 N(0,1) stellarness-of-profile statistic in Ul real 4 -0.9999995e9 stat

ulClassStat atlasSource ATLASDR5 N(0,1) stellarness-of-profile statistic in Ul real 4 -0.9999995e9 stat

ulClassStat atlasSource ATLASv20160425 N(0,1) stellarness-of-profile statistic in Ul real 4 -0.9999995e9 stat

ulClassStat atlasSource ATLASv20180209 N(0,1) stellarness-of-profile statistic in Ul real 4 -0.9999995e9 stat

ulEll atlasSource ATLASDR2 1-b/a, where a/b=semi-major/minor axes in Ul real 4 -0.9999995e9 src.ellipticity

ulEll atlasSource ATLASDR3 1-b/a, where a/b=semi-major/minor axes in Ul real 4 -0.9999995e9 src.ellipticity

ulEll atlasSource ATLASDR4 1-b/a, where a/b=semi-major/minor axes in Ul real 4 -0.9999995e9 src.ellipticity

ulEll atlasSource ATLASDR5 1-b/a, where a/b=semi-major/minor axes in Ul real 4 -0.9999995e9 src.ellipticity

ulEll atlasSource ATLASv20160425 1-b/a, where a/b=semi-major/minor axes in Ul real 4 -0.9999995e9 src.ellipticity

ulEll atlasSource ATLASv20180209 1-b/a, where a/b=semi-major/minor axes in Ul real 4 -0.9999995e9 src.ellipticity

uleNum atlasMergeLog ATLASDR2 the extension number of this Ul frame tinyint 1 meta.number

uleNum atlasMergeLog ATLASDR3 the extension number of this Ul frame tinyint 1 meta.number

uleNum atlasMergeLog ATLASDR4 the extension number of this Ul frame tinyint 1 meta.number

uleNum atlasMergeLog ATLASDR5 the extension number of this Ul frame tinyint 1 meta.id

uleNum atlasMergeLog ATLASv20160425 the extension number of this Ul frame tinyint 1 meta.number

uleNum atlasMergeLog ATLASv20180209 the extension number of this Ul frame tinyint 1 meta.number

ulErrBits atlasSource ATLASDR2 processing warning/error bitwise flags in Ul int 4 -99999999 meta.code

Apparently not actually an error bit flag, but a count of the number of zero confidence pixels in the default (2 arcsec diameter) aperture.

ulErrBits atlasSource ATLASDR3 processing warning/error bitwise flags in Ul int 4 -99999999 meta.code

Apparently not actually an error bit flag, but a count of the number of zero confidence pixels in the default (2 arcsec diameter) aperture.

ulErrBits atlasSource ATLASDR4 processing warning/error bitwise flags in Ul int 4 -99999999 meta.code

Apparently not actually an error bit flag, but a count of the number of zero confidence pixels in the default (2 arcsec diameter) aperture.

ulErrBits atlasSource ATLASDR5 processing warning/error bitwise flags in Ul int 4 -99999999 meta.code

Apparently not actually an error bit flag, but a count of the number of zero confidence pixels in the default (2 arcsec diameter) aperture.

ulErrBits atlasSource ATLASv20160425 processing warning/error bitwise flags in Ul int 4 -99999999 meta.code

Apparently not actually an error bit flag, but a count of the number of zero confidence pixels in the default (2 arcsec diameter) aperture.

ulErrBits atlasSource ATLASv20180209 processing warning/error bitwise flags in Ul int 4 -99999999 meta.code

Apparently not actually an error bit flag, but a count of the number of zero confidence pixels in the default (2 arcsec diameter) aperture.

ulEta atlasSource ATLASDR2 Offset of Ul detection from master position (+north/-south) real 4 arcsec -0.9999995e9 pos.eq.dec;arith.diff

When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 1.0 arcseconds is used. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the VHS, you might wish to insist that the offsets in the selected sample are all below 0.5 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want. NB: the master position is the position of the detection in the shortest passband in the set, rather than the ra/dec of the source as stored in source attributes of the same name. The former is used in the pairing process, while the latter is generally the optimally weighted mean position from an astrometric solution or other combinatorial process of all individual detection positions across the available passbands.

ulEta atlasSource ATLASDR3 Offset of Ul detection from master position (+north/-south) real 4 arcsec -0.9999995e9 pos.eq.dec;arith.diff

When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 1.0 arcseconds is used. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the VHS, you might wish to insist that the offsets in the selected sample are all below 0.5 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want. NB: the master position is the position of the detection in the shortest passband in the set, rather than the ra/dec of the source as stored in source attributes of the same name. The former is used in the pairing process, while the latter is generally the optimally weighted mean position from an astrometric solution or other combinatorial process of all individual detection positions across the available passbands.

ulEta atlasSource ATLASDR4 Offset of Ul detection from master position (+north/-south) real 4 arcsec -0.9999995e9 pos.eq.dec;arith.diff

When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 1.0 arcseconds is used. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the VHS, you might wish to insist that the offsets in the selected sample are all below 0.5 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want. NB: the master position is the position of the detection in the shortest passband in the set, rather than the ra/dec of the source as stored in source attributes of the same name. The former is used in the pairing process, while the latter is generally the optimally weighted mean position from an astrometric solution or other combinatorial process of all individual detection positions across the available passbands.

ulEta atlasSource ATLASDR5 Offset of Ul detection from master position (+north/-south) real 4 arcsec -0.9999995e9 pos.eq.dec;arith.diff

When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 1.0 arcseconds is used. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the VHS, you might wish to insist that the offsets in the selected sample are all below 0.5 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want. NB: the master position is the position of the detection in the shortest passband in the set, rather than the ra/dec of the source as stored in source attributes of the same name. The former is used in the pairing process, while the latter is generally the optimally weighted mean position from an astrometric solution or other combinatorial process of all individual detection positions across the available passbands.

ulEta atlasSource ATLASv20160425 Offset of Ul detection from master position (+north/-south) real 4 arcsec -0.9999995e9 pos.eq.dec;arith.diff

When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 1.0 arcseconds is used. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the VHS, you might wish to insist that the offsets in the selected sample are all below 0.5 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want. NB: the master position is the position of the detection in the shortest passband in the set, rather than the ra/dec of the source as stored in source attributes of the same name. The former is used in the pairing process, while the latter is generally the optimally weighted mean position from an astrometric solution or other combinatorial process of all individual detection positions across the available passbands.

ulEta atlasSource ATLASv20180209 Offset of Ul detection from master position (+north/-south) real 4 arcsec -0.9999995e9 pos.eq.dec;arith.diff

When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 1.0 arcseconds is used. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the VHS, you might wish to insist that the offsets in the selected sample are all below 0.5 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want. NB: the master position is the position of the detection in the shortest passband in the set, rather than the ra/dec of the source as stored in source attributes of the same name. The former is used in the pairing process, while the latter is generally the optimally weighted mean position from an astrometric solution or other combinatorial process of all individual detection positions across the available passbands.

ulGausig atlasSource ATLASDR2 RMS of axes of ellipse fit in Ul real 4 pixels -0.9999995e9 src.morph.param

ulGausig atlasSource ATLASDR3 RMS of axes of ellipse fit in Ul real 4 pixels -0.9999995e9 src.morph.param

ulGausig atlasSource ATLASDR4 RMS of axes of ellipse fit in Ul real 4 pixels -0.9999995e9 src.morph.param

ulGausig atlasSource ATLASDR5 RMS of axes of ellipse fit in Ul real 4 pixels -0.9999995e9 src.morph.param

ulGausig atlasSource ATLASv20160425 RMS of axes of ellipse fit in Ul real 4 pixels -0.9999995e9 src.morph.param

ulGausig atlasSource ATLASv20180209 RMS of axes of ellipse fit in Ul real 4 pixels -0.9999995e9 src.morph.param

ulHlCorSMjRadAs atlasSource ATLASDR2 Seeing corrected half-light, semi-major axis in Ul band real 4 arcsec -0.9999995e9 phys.angSize;src

ulHlCorSMjRadAs atlasSource ATLASDR3 Seeing corrected half-light, semi-major axis in Ul band real 4 arcsec -0.9999995e9 phys.angSize

ulHlCorSMjRadAs atlasSource ATLASDR4 Seeing corrected half-light, semi-major axis in Ul band real 4 arcsec -0.9999995e9 phys.angSize

ulHlCorSMjRadAs atlasSource ATLASDR5 Seeing corrected half-light, semi-major axis in Ul band real 4 arcsec -0.9999995e9 phys.angSize

ulHlCorSMjRadAs atlasSource ATLASv20160425 Seeing corrected half-light, semi-major axis in Ul band real 4 arcsec -0.9999995e9 phys.angSize

ulHlCorSMjRadAs atlasSource ATLASv20180209 Seeing corrected half-light, semi-major axis in Ul band real 4 arcsec -0.9999995e9 phys.angSize

ulKronMag atlasSource ATLASDR4 Extended source Ul mag (Kron) real 4 mag -0.9999995e9 phot.mag

ulKronMag atlasSource ATLASDR5 Extended source Ul mag (Kron) real 4 mag -0.9999995e9 phot.mag

ulKronMag atlasSource ATLASv20180209 Extended source Ul mag (Kron) real 4 mag -0.9999995e9 phot.mag

ulKronMagErr atlasSource ATLASDR4 Error in extended source Ul mag (Kron) real 4 mag -0.9999995e9 stat.error;phot.mag

ulKronMagErr atlasSource ATLASDR5 Error in extended source Ul mag (Kron) real 4 mag -0.9999995e9 stat.error;phot.mag

ulKronMagErr atlasSource ATLASv20180209 Error in extended source Ul mag (Kron) real 4 mag -0.9999995e9 stat.error;phot.mag

ulmfID atlasMergeLog ATLASDR2 the UID of the relevant Ul multiframe bigint 8 obs.field

ulmfID atlasMergeLog ATLASDR3 the UID of the relevant Ul multiframe bigint 8 meta.id;obs.field

ulmfID atlasMergeLog ATLASDR4 the UID of the relevant Ul multiframe bigint 8 meta.id;obs.field

ulmfID atlasMergeLog ATLASDR5 the UID of the relevant Ul multiframe bigint 8 meta.id;obs.field

ulmfID atlasMergeLog ATLASv20160425 the UID of the relevant Ul multiframe bigint 8 meta.id;obs.field

ulmfID atlasMergeLog ATLASv20180209 the UID of the relevant Ul multiframe bigint 8 meta.id;obs.field

ulmgExt atlasSource ATLASDR2 Extended source colour Ul-G (using aperMagNoAperCorr3) real 4 mag -0.9999995e9 PHOT_COLOR

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

ulmgExt atlasSource ATLASDR3 Extended source colour Ul-G (using aperMagNoAperCorr3) real 4 mag -0.9999995e9 phot.color;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

ulmgExt atlasSource ATLASDR4 Extended source colour Ul-G (using aperMagNoAperCorr3) real 4 mag -0.9999995e9 phot.color;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

ulmgExt atlasSource ATLASDR5 Extended source colour Ul-G (using aperMagNoAperCorr3) real 4 mag -0.9999995e9 phot.color;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

ulmgExt atlasSource ATLASv20160425 Extended source colour Ul-G (using aperMagNoAperCorr3) real 4 mag -0.9999995e9 phot.color;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

ulmgExt atlasSource ATLASv20180209 Extended source colour Ul-G (using aperMagNoAperCorr3) real 4 mag -0.9999995e9 phot.color;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

ulmgExtErr atlasSource ATLASDR2 Error on extended source colour Ul-G real 4 mag -0.9999995e9 stat.error

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

ulmgExtErr atlasSource ATLASDR3 Error on extended source colour Ul-G real 4 mag -0.9999995e9 stat.error;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

ulmgExtErr atlasSource ATLASDR4 Error on extended source colour Ul-G real 4 mag -0.9999995e9 stat.error;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

ulmgExtErr atlasSource ATLASDR5 Error on extended source colour Ul-G real 4 mag -0.9999995e9 stat.error;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

ulmgExtErr atlasSource ATLASv20160425 Error on extended source colour Ul-G real 4 mag -0.9999995e9 stat.error;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

ulmgExtErr atlasSource ATLASv20180209 Error on extended source colour Ul-G real 4 mag -0.9999995e9 stat.error;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

ulmgPnt atlasSource ATLASDR2 Point source colour Ul-G (using aperMag3) real 4 mag -0.9999995e9 PHOT_COLOR

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

ulmgPnt atlasSource ATLASDR3 Point source colour Ul-G (using aperMag3) real 4 mag -0.9999995e9 phot.color;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

ulmgPnt atlasSource ATLASDR4 Point source colour Ul-G (using aperMag3) real 4 mag -0.9999995e9 phot.color;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

ulmgPnt atlasSource ATLASDR5 Point source colour Ul-G (using aperMag3) real 4 mag -0.9999995e9 phot.color;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

ulmgPnt atlasSource ATLASv20160425 Point source colour Ul-G (using aperMag3) real 4 mag -0.9999995e9 phot.color;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

ulmgPnt atlasSource ATLASv20180209 Point source colour Ul-G (using aperMag3) real 4 mag -0.9999995e9 phot.color;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

ulmgPntErr atlasSource ATLASDR2 Error on point source colour Ul-G real 4 mag -0.9999995e9 stat.error

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

ulmgPntErr atlasSource ATLASDR3 Error on point source colour Ul-G real 4 mag -0.9999995e9 stat.error;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

ulmgPntErr atlasSource ATLASDR4 Error on point source colour Ul-G real 4 mag -0.9999995e9 stat.error;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

ulmgPntErr atlasSource ATLASDR5 Error on point source colour Ul-G real 4 mag -0.9999995e9 stat.error;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

ulmgPntErr atlasSource ATLASv20160425 Error on point source colour Ul-G real 4 mag -0.9999995e9 stat.error;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

ulmgPntErr atlasSource ATLASv20180209 Error on point source colour Ul-G real 4 mag -0.9999995e9 stat.error;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

ulMjd atlasSource ATLASDR3 The mean Modified Julian Day of each detection float 8 day -0.9999995e9 time.epoch

ulMjd atlasSource ATLASDR4 The mean Modified Julian Day of each detection float 8 day -0.9999995e9 time.epoch

ulMjd atlasSource ATLASDR5 The mean Modified Julian Day of each detection float 8 day -0.9999995e9 time.epoch

ulMjd atlasSource ATLASv20160425 The mean Modified Julian Day of each detection float 8 day -0.9999995e9 time.epoch

ulMjd atlasSource ATLASv20180209 The mean Modified Julian Day of each detection float 8 day -0.9999995e9 time.epoch

ulPA atlasSource ATLASDR2 ellipse fit celestial orientation in Ul real 4 Degrees -0.9999995e9 pos.posAng

ulPA atlasSource ATLASDR3 ellipse fit celestial orientation in Ul real 4 Degrees -0.9999995e9 pos.posAng

ulPA atlasSource ATLASDR4 ellipse fit celestial orientation in Ul real 4 Degrees -0.9999995e9 pos.posAng

ulPA atlasSource ATLASDR5 ellipse fit celestial orientation in Ul real 4 Degrees -0.9999995e9 pos.posAng

ulPA atlasSource ATLASv20160425 ellipse fit celestial orientation in Ul real 4 Degrees -0.9999995e9 pos.posAng

ulPA atlasSource ATLASv20180209 ellipse fit celestial orientation in Ul real 4 Degrees -0.9999995e9 pos.posAng

ulPetroMag atlasSource ATLASDR2 Extended source Ul mag (Petrosian) real 4 mag -0.9999995e9 phot.mag

ulPetroMag atlasSource ATLASDR3 Extended source Ul mag (Petrosian) real 4 mag -0.9999995e9 phot.mag

ulPetroMag atlasSource ATLASDR4 Extended source Ul mag (Petrosian) real 4 mag -0.9999995e9 phot.mag

ulPetroMag atlasSource ATLASDR5 Extended source Ul mag (Petrosian) real 4 mag -0.9999995e9 phot.mag

ulPetroMag atlasSource ATLASv20160425 Extended source Ul mag (Petrosian) real 4 mag -0.9999995e9 phot.mag

ulPetroMag atlasSource ATLASv20180209 Extended source Ul mag (Petrosian) real 4 mag -0.9999995e9 phot.mag

ulPetroMagErr atlasSource ATLASDR2 Error in extended source Ul mag (Petrosian) real 4 mag -0.9999995e9 stat.error

ulPetroMagErr atlasSource ATLASDR3 Error in extended source Ul mag (Petrosian) real 4 mag -0.9999995e9 stat.error;phot.mag

ulPetroMagErr atlasSource ATLASDR4 Error in extended source Ul mag (Petrosian) real 4 mag -0.9999995e9 stat.error;phot.mag

ulPetroMagErr atlasSource ATLASDR5 Error in extended source Ul mag (Petrosian) real 4 mag -0.9999995e9 stat.error;phot.mag

ulPetroMagErr atlasSource ATLASv20160425 Error in extended source Ul mag (Petrosian) real 4 mag -0.9999995e9 stat.error;phot.mag

ulPetroMagErr atlasSource ATLASv20180209 Error in extended source Ul mag (Petrosian) real 4 mag -0.9999995e9 stat.error;phot.mag

ulppErrBits atlasSource ATLASDR2 additional WFAU post-processing error bits in Ul int 4 0 meta.code

Post-processing error quality bit flags assigned to detections in the archive curation procedure for survey data. From least to most significant byte in the 4-byte integer attribute byte 0 (bits 0 to 7) corresponds to information on generally innocuous conditions that are nonetheless potentially significant as regards the integrity of that detection; byte 1 (bits 8 to 15) corresponds to warnings; byte 2 (bits 16 to 23) corresponds to important warnings; and finally byte 3 (bits 24 to 31) corresponds to severe warnings:

Byte Bit Detection quality issue Threshold or bit mask Applies to

Decimal Hexadecimal

0 4 Deblended 16 0x00000010 All VDFS catalogues

0 6 Bad pixel(s) in default aperture 64 0x00000040 All VDFS catalogues

0 7 Low confidence in default aperture 128 0x00000080 All VDFS catalogues

1 12 Lies within detector 16 region of a tile 4096 0x00001000 All catalogues from tiles

2 16 Close to saturated 65536 0x00010000 All VDFS catalogues

2 17 Photometric calibration probably subject to systematic error 131072 0x00020000 VVV only

2 22 Lies within a dither offset of the stacked frame boundary 4194304 0x00400000 All catalogues

2 23 Lies within the underexposed strip (or "ear") of a tile 8388608 0x00800000 All catalogues from tiles

3 24 Lies within an underexposed region of a tile due to missing detector 16777216 0x01000000 All catalogues from tiles

In this way, the higher the error quality bit flag value, the more likely it is that the detection is spurious. The decimal threshold (column 4) gives the minimum value of the quality flag for a detection having the given condition (since other bits in the flag may be set also; the corresponding hexadecimal value, where each digit corresponds to 4 bits in the flag, can be easier to compute when writing SQL queries to test for a given condition). For example, to exclude all Ks band sources in the VHS having any error quality condition other than informational ones, include a predicate ... AND kppErrBits ≤ 255. See the SQL Cookbook and other online pages for further information.

ulppErrBits atlasSource ATLASDR3 additional WFAU post-processing error bits in Ul int 4 0 meta.code

Post-processing error quality bit flags assigned to detections in the archive curation procedure for survey data. From least to most significant byte in the 4-byte integer attribute byte 0 (bits 0 to 7) corresponds to information on generally innocuous conditions that are nonetheless potentially significant as regards the integrity of that detection; byte 1 (bits 8 to 15) corresponds to warnings; byte 2 (bits 16 to 23) corresponds to important warnings; and finally byte 3 (bits 24 to 31) corresponds to severe warnings:

Byte Bit Detection quality issue Threshold or bit mask Applies to

Decimal Hexadecimal

0 4 Deblended 16 0x00000010 All VDFS catalogues

0 6 Bad pixel(s) in default aperture 64 0x00000040 All VDFS catalogues

0 7 Low confidence in default aperture 128 0x00000080 All VDFS catalogues

1 12 Lies within detector 16 region of a tile 4096 0x00001000 All catalogues from tiles

2 16 Close to saturated 65536 0x00010000 All VDFS catalogues

2 17 Photometric calibration probably subject to systematic error 131072 0x00020000 VVV only

2 22 Lies within a dither offset of the stacked frame boundary 4194304 0x00400000 All catalogues

2 23 Lies within the underexposed strip (or "ear") of a tile 8388608 0x00800000 All catalogues from tiles

3 24 Lies within an underexposed region of a tile due to missing detector 16777216 0x01000000 All catalogues from tiles

In this way, the higher the error quality bit flag value, the more likely it is that the detection is spurious. The decimal threshold (column 4) gives the minimum value of the quality flag for a detection having the given condition (since other bits in the flag may be set also; the corresponding hexadecimal value, where each digit corresponds to 4 bits in the flag, can be easier to compute when writing SQL queries to test for a given condition). For example, to exclude all Ks band sources in the VHS having any error quality condition other than informational ones, include a predicate ... AND kppErrBits ≤ 255. See the SQL Cookbook and other online pages for further information.

ulppErrBits atlasSource ATLASDR4 additional WFAU post-processing error bits in Ul int 4 0 meta.code

Post-processing error quality bit flags assigned to detections in the archive curation procedure for survey data. From least to most significant byte in the 4-byte integer attribute byte 0 (bits 0 to 7) corresponds to information on generally innocuous conditions that are nonetheless potentially significant as regards the integrity of that detection; byte 1 (bits 8 to 15) corresponds to warnings; byte 2 (bits 16 to 23) corresponds to important warnings; and finally byte 3 (bits 24 to 31) corresponds to severe warnings:

Byte Bit Detection quality issue Threshold or bit mask Applies to

Decimal Hexadecimal

0 4 Deblended 16 0x00000010 All VDFS catalogues

0 6 Bad pixel(s) in default aperture 64 0x00000040 All VDFS catalogues

0 7 Low confidence in default aperture 128 0x00000080 All VDFS catalogues

1 12 Lies within detector 16 region of a tile 4096 0x00001000 All catalogues from tiles

2 16 Close to saturated 65536 0x00010000 All VDFS catalogues

2 17 Photometric calibration probably subject to systematic error 131072 0x00020000 VVV only

2 22 Lies within a dither offset of the stacked frame boundary 4194304 0x00400000 All catalogues

2 23 Lies within the underexposed strip (or "ear") of a tile 8388608 0x00800000 All catalogues from tiles

3 24 Lies within an underexposed region of a tile due to missing detector 16777216 0x01000000 All catalogues from tiles

In this way, the higher the error quality bit flag value, the more likely it is that the detection is spurious. The decimal threshold (column 4) gives the minimum value of the quality flag for a detection having the given condition (since other bits in the flag may be set also; the corresponding hexadecimal value, where each digit corresponds to 4 bits in the flag, can be easier to compute when writing SQL queries to test for a given condition). For example, to exclude all Ks band sources in the VHS having any error quality condition other than informational ones, include a predicate ... AND kppErrBits ≤ 255. See the SQL Cookbook and other online pages for further information.

ulppErrBits atlasSource ATLASDR5 additional WFAU post-processing error bits in Ul int 4 0 meta.code

Post-processing error quality bit flags assigned to detections in the archive curation procedure for survey data. From least to most significant byte in the 4-byte integer attribute byte 0 (bits 0 to 7) corresponds to information on generally innocuous conditions that are nonetheless potentially significant as regards the integrity of that detection; byte 1 (bits 8 to 15) corresponds to warnings; byte 2 (bits 16 to 23) corresponds to important warnings; and finally byte 3 (bits 24 to 31) corresponds to severe warnings:

Byte Bit Detection quality issue Threshold or bit mask Applies to

Decimal Hexadecimal

0 4 Deblended 16 0x00000010 All VDFS catalogues

0 6 Bad pixel(s) in default aperture 64 0x00000040 All VDFS catalogues

0 7 Low confidence in default aperture 128 0x00000080 All VDFS catalogues

1 12 Lies within detector 16 region of a tile 4096 0x00001000 All catalogues from tiles

2 16 Close to saturated 65536 0x00010000 All VDFS catalogues

2 17 Photometric calibration probably subject to systematic error 131072 0x00020000 VVV only

2 22 Lies within a dither offset of the stacked frame boundary 4194304 0x00400000 All catalogues

2 23 Lies within the underexposed strip (or "ear") of a tile 8388608 0x00800000 All catalogues from tiles

3 24 Lies within an underexposed region of a tile due to missing detector 16777216 0x01000000 All catalogues from tiles

In this way, the higher the error quality bit flag value, the more likely it is that the detection is spurious. The decimal threshold (column 4) gives the minimum value of the quality flag for a detection having the given condition (since other bits in the flag may be set also; the corresponding hexadecimal value, where each digit corresponds to 4 bits in the flag, can be easier to compute when writing SQL queries to test for a given condition). For example, to exclude all Ks band sources in the VHS having any error quality condition other than informational ones, include a predicate ... AND kppErrBits ≤ 255. See the SQL Cookbook and other online pages for further information.

ulppErrBits atlasSource ATLASv20160425 additional WFAU post-processing error bits in Ul int 4 0 meta.code

Post-processing error quality bit flags assigned to detections in the archive curation procedure for survey data. From least to most significant byte in the 4-byte integer attribute byte 0 (bits 0 to 7) corresponds to information on generally innocuous conditions that are nonetheless potentially significant as regards the integrity of that detection; byte 1 (bits 8 to 15) corresponds to warnings; byte 2 (bits 16 to 23) corresponds to important warnings; and finally byte 3 (bits 24 to 31) corresponds to severe warnings:

Byte Bit Detection quality issue Threshold or bit mask Applies to

Decimal Hexadecimal

0 4 Deblended 16 0x00000010 All VDFS catalogues

0 6 Bad pixel(s) in default aperture 64 0x00000040 All VDFS catalogues

0 7 Low confidence in default aperture 128 0x00000080 All VDFS catalogues

1 12 Lies within detector 16 region of a tile 4096 0x00001000 All catalogues from tiles

2 16 Close to saturated 65536 0x00010000 All VDFS catalogues

2 17 Photometric calibration probably subject to systematic error 131072 0x00020000 VVV only

2 22 Lies within a dither offset of the stacked frame boundary 4194304 0x00400000 All catalogues

2 23 Lies within the underexposed strip (or "ear") of a tile 8388608 0x00800000 All catalogues from tiles

3 24 Lies within an underexposed region of a tile due to missing detector 16777216 0x01000000 All catalogues from tiles

In this way, the higher the error quality bit flag value, the more likely it is that the detection is spurious. The decimal threshold (column 4) gives the minimum value of the quality flag for a detection having the given condition (since other bits in the flag may be set also; the corresponding hexadecimal value, where each digit corresponds to 4 bits in the flag, can be easier to compute when writing SQL queries to test for a given condition). For example, to exclude all Ks band sources in the VHS having any error quality condition other than informational ones, include a predicate ... AND kppErrBits ≤ 255. See the SQL Cookbook and other online pages for further information.

ulppErrBits atlasSource ATLASv20180209 additional WFAU post-processing error bits in Ul int 4 0 meta.code

Post-processing error quality bit flags assigned to detections in the archive curation procedure for survey data. From least to most significant byte in the 4-byte integer attribute byte 0 (bits 0 to 7) corresponds to information on generally innocuous conditions that are nonetheless potentially significant as regards the integrity of that detection; byte 1 (bits 8 to 15) corresponds to warnings; byte 2 (bits 16 to 23) corresponds to important warnings; and finally byte 3 (bits 24 to 31) corresponds to severe warnings:

Byte Bit Detection quality issue Threshold or bit mask Applies to

Decimal Hexadecimal

0 4 Deblended 16 0x00000010 All VDFS catalogues

0 6 Bad pixel(s) in default aperture 64 0x00000040 All VDFS catalogues

0 7 Low confidence in default aperture 128 0x00000080 All VDFS catalogues

1 12 Lies within detector 16 region of a tile 4096 0x00001000 All catalogues from tiles

2 16 Close to saturated 65536 0x00010000 All VDFS catalogues

2 17 Photometric calibration probably subject to systematic error 131072 0x00020000 VVV only

2 22 Lies within a dither offset of the stacked frame boundary 4194304 0x00400000 All catalogues

2 23 Lies within the underexposed strip (or "ear") of a tile 8388608 0x00800000 All catalogues from tiles

3 24 Lies within an underexposed region of a tile due to missing detector 16777216 0x01000000 All catalogues from tiles

In this way, the higher the error quality bit flag value, the more likely it is that the detection is spurious. The decimal threshold (column 4) gives the minimum value of the quality flag for a detection having the given condition (since other bits in the flag may be set also; the corresponding hexadecimal value, where each digit corresponds to 4 bits in the flag, can be easier to compute when writing SQL queries to test for a given condition). For example, to exclude all Ks band sources in the VHS having any error quality condition other than informational ones, include a predicate ... AND kppErrBits ≤ 255. See the SQL Cookbook and other online pages for further information.

ulPsfMag atlasSource ATLASDR2 Point source profile-fitted Ul mag real 4 mag -0.9999995e9 phot.mag

ulPsfMag atlasSource ATLASDR3 Point source profile-fitted Ul mag real 4 mag -0.9999995e9 phot.mag

ulPsfMag atlasSource ATLASv20160425 Point source profile-fitted Ul mag real 4 mag -0.9999995e9 phot.mag

ulPsfMagErr atlasSource ATLASDR2 Error in point source profile-fitted Ul mag real 4 mag -0.9999995e9 stat.error

ulPsfMagErr atlasSource ATLASDR3 Error in point source profile-fitted Ul mag real 4 mag -0.9999995e9 stat.error;phot.mag

ulPsfMagErr atlasSource ATLASv20160425 Error in point source profile-fitted Ul mag real 4 mag -0.9999995e9 stat.error;phot.mag

ulSeqNum atlasSource ATLASDR2 the running number of the Ul detection int 4 -99999999 meta.id

ulSeqNum atlasSource ATLASDR3 the running number of the Ul detection int 4 -99999999 meta.number

ulSeqNum atlasSource ATLASDR4 the running number of the Ul detection int 4 -99999999 meta.number

ulSeqNum atlasSource ATLASDR5 the running number of the Ul detection int 4 -99999999 meta.id

ulSeqNum atlasSource ATLASv20160425 the running number of the Ul detection int 4 -99999999 meta.number

ulSeqNum atlasSource ATLASv20180209 the running number of the Ul detection int 4 -99999999 meta.number

ulSerMag2D atlasSource ATLASDR2 Extended source Ul mag (profile-fitted) real 4 mag -0.9999995e9 phot.mag

ulSerMag2D atlasSource ATLASDR3 Extended source Ul mag (profile-fitted) real 4 mag -0.9999995e9 phot.mag

ulSerMag2D atlasSource ATLASv20160425 Extended source Ul mag (profile-fitted) real 4 mag -0.9999995e9 phot.mag

ulSerMag2DErr atlasSource ATLASDR2 Error in extended source Ul mag (profile-fitted) real 4 mag -0.9999995e9 stat.error

ulSerMag2DErr atlasSource ATLASDR3 Error in extended source Ul mag (profile-fitted) real 4 mag -0.9999995e9 stat.error;phot.mag

ulSerMag2DErr atlasSource ATLASv20160425 Error in extended source Ul mag (profile-fitted) real 4 mag -0.9999995e9 stat.error;phot.mag

ulXi atlasSource ATLASDR2 Offset of Ul detection from master position (+east/-west) real 4 arcsec -0.9999995e9 pos.eq.ra;arith.diff

When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 1.0 arcseconds is used. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the VHS, you might wish to insist that the offsets in the selected sample are all below 0.5 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want. NB: the master position is the position of the detection in the shortest passband in the set, rather than the ra/dec of the source as stored in source attributes of the same name. The former is used in the pairing process, while the latter is generally the optimally weighted mean position from an astrometric solution or other combinatorial process of all individual detection positions across the available passbands.

ulXi atlasSource ATLASDR3 Offset of Ul detection from master position (+east/-west) real 4 arcsec -0.9999995e9 pos.eq.ra;arith.diff

When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 1.0 arcseconds is used. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the VHS, you might wish to insist that the offsets in the selected sample are all below 0.5 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want. NB: the master position is the position of the detection in the shortest passband in the set, rather than the ra/dec of the source as stored in source attributes of the same name. The former is used in the pairing process, while the latter is generally the optimally weighted mean position from an astrometric solution or other combinatorial process of all individual detection positions across the available passbands.

ulXi atlasSource ATLASDR4 Offset of Ul detection from master position (+east/-west) real 4 arcsec -0.9999995e9 pos.eq.ra;arith.diff

When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 1.0 arcseconds is used. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the VHS, you might wish to insist that the offsets in the selected sample are all below 0.5 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want. NB: the master position is the position of the detection in the shortest passband in the set, rather than the ra/dec of the source as stored in source attributes of the same name. The former is used in the pairing process, while the latter is generally the optimally weighted mean position from an astrometric solution or other combinatorial process of all individual detection positions across the available passbands.

ulXi atlasSource ATLASDR5 Offset of Ul detection from master position (+east/-west) real 4 arcsec -0.9999995e9 pos.eq.ra;arith.diff

When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 1.0 arcseconds is used. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the VHS, you might wish to insist that the offsets in the selected sample are all below 0.5 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want. NB: the master position is the position of the detection in the shortest passband in the set, rather than the ra/dec of the source as stored in source attributes of the same name. The former is used in the pairing process, while the latter is generally the optimally weighted mean position from an astrometric solution or other combinatorial process of all individual detection positions across the available passbands.

ulXi atlasSource ATLASv20160425 Offset of Ul detection from master position (+east/-west) real 4 arcsec -0.9999995e9 pos.eq.ra;arith.diff

When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 1.0 arcseconds is used. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the VHS, you might wish to insist that the offsets in the selected sample are all below 0.5 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want. NB: the master position is the position of the detection in the shortest passband in the set, rather than the ra/dec of the source as stored in source attributes of the same name. The former is used in the pairing process, while the latter is generally the optimally weighted mean position from an astrometric solution or other combinatorial process of all individual detection positions across the available passbands.

ulXi atlasSource ATLASv20180209 Offset of Ul detection from master position (+east/-west) real 4 arcsec -0.9999995e9 pos.eq.ra;arith.diff

When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 1.0 arcseconds is used. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the VHS, you might wish to insist that the offsets in the selected sample are all below 0.5 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want. NB: the master position is the position of the detection in the shortest passband in the set, rather than the ra/dec of the source as stored in source attributes of the same name. The former is used in the pairing process, while the latter is generally the optimally weighted mean position from an astrometric solution or other combinatorial process of all individual detection positions across the available passbands.

umfID atlasMergeLog ATLASDR1 the UID of the relevant U multiframe bigint 8 obs.field

umfID atlasMergeLog ATLASDR2 the UID of the relevant U multiframe bigint 8 obs.field

umfID atlasMergeLog ATLASDR3 the UID of the relevant U multiframe bigint 8 meta.id;obs.field;em.opt.U

umfID atlasMergeLog ATLASDR4 the UID of the relevant U multiframe bigint 8 meta.id;obs.field;em.opt.U

umfID atlasMergeLog ATLASDR5 the UID of the relevant U multiframe bigint 8 meta.id;obs.field;em.opt.U

umfID atlasMergeLog ATLASv20131127 the UID of the relevant U multiframe bigint 8 obs.field

umfID atlasMergeLog ATLASv20160425 the UID of the relevant U multiframe bigint 8 meta.id;obs.field;em.opt.U

umfID atlasMergeLog ATLASv20180209 the UID of the relevant U multiframe bigint 8 meta.id;obs.field;em.opt.U

umfID vphasMergeLog VPHASDR3 the UID of the relevant U multiframe bigint 8 meta.id;obs.field;em.opt.U

umfID vphasMergeLog VPHASv20160112 the UID of the relevant U multiframe bigint 8 meta.id;obs.field;em.opt.U

umfID vphasMergeLog VPHASv20170222 the UID of the relevant U multiframe bigint 8 meta.id;obs.field;em.opt.U

umgExt atlasSource ATLASDR1 Extended source colour U-G (using aperMagNoAperCorr3) real 4 mag -0.9999995e9 PHOT_COLOR

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

umgExt atlasSource ATLASDR2 Extended source colour U-G (using aperMagNoAperCorr3) real 4 mag -0.9999995e9 PHOT_COLOR

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

umgExt atlasSource ATLASDR3 Extended source colour U-G (using aperMagNoAperCorr3) real 4 mag -0.9999995e9 phot.color;em.opt.U;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

umgExt atlasSource ATLASDR4 Extended source colour U-G (using aperMagNoAperCorr3) real 4 mag -0.9999995e9 phot.color;em.opt.U;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

umgExt atlasSource ATLASDR5 Extended source colour U-G (using aperMagNoAperCorr3) real 4 mag -0.9999995e9 phot.color;em.opt.U;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

umgExt atlasSource ATLASv20131127 Extended source colour U-G (using aperMagNoAperCorr3) real 4 mag -0.9999995e9 PHOT_COLOR

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

umgExt atlasSource ATLASv20160425 Extended source colour U-G (using aperMagNoAperCorr3) real 4 mag -0.9999995e9 phot.color;em.opt.U;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

umgExt atlasSource ATLASv20180209 Extended source colour U-G (using aperMagNoAperCorr3) real 4 mag -0.9999995e9 phot.color;em.opt.U;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

umgExt vphasSource VPHASDR3 Extended source colour U-G (using aperMagNoAperCorr3) real 4 mag -0.9999995e9 phot.color;em.opt.U;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

umgExt vphasSource VPHASv20160112 Extended source colour U-G (using aperMagNoAperCorr3) real 4 mag -0.9999995e9 phot.color;em.opt.U;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

umgExt vphasSource VPHASv20170222 Extended source colour U-G (using aperMagNoAperCorr3) real 4 mag -0.9999995e9 phot.color;em.opt.U;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

umgExtErr atlasSource ATLASDR1 Error on extended source colour U-G real 4 mag -0.9999995e9 stat.error

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

umgExtErr atlasSource ATLASDR2 Error on extended source colour U-G real 4 mag -0.9999995e9 stat.error

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

umgExtErr atlasSource ATLASDR3 Error on extended source colour U-G real 4 mag -0.9999995e9 stat.error;em.opt.U;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

umgExtErr atlasSource ATLASDR4 Error on extended source colour U-G real 4 mag -0.9999995e9 stat.error;em.opt.U;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

umgExtErr atlasSource ATLASDR5 Error on extended source colour U-G real 4 mag -0.9999995e9 stat.error;em.opt.U;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

umgExtErr atlasSource ATLASv20131127 Error on extended source colour U-G real 4 mag -0.9999995e9 stat.error

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

umgExtErr atlasSource ATLASv20160425 Error on extended source colour U-G real 4 mag -0.9999995e9 stat.error;em.opt.U;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

umgExtErr atlasSource ATLASv20180209 Error on extended source colour U-G real 4 mag -0.9999995e9 stat.error;em.opt.U;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

umgExtErr vphasSource VPHASDR3 Error on extended source colour U-G real 4 mag -0.9999995e9 stat.error;em.opt.U;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

umgExtErr vphasSource VPHASv20160112 Error on extended source colour U-G real 4 mag -0.9999995e9 stat.error;em.opt.U;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

umgExtErr vphasSource VPHASv20170222 Error on extended source colour U-G real 4 mag -0.9999995e9 stat.error;em.opt.U;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

umgPnt atlasSource ATLASDR1 Point source colour U-G (using aperMag3) real 4 mag -0.9999995e9 PHOT_COLOR

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

umgPnt atlasSource ATLASDR2 Point source colour U-G (using aperMag3) real 4 mag -0.9999995e9 PHOT_COLOR

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

umgPnt atlasSource ATLASDR3 Point source colour U-G (using aperMag3) real 4 mag -0.9999995e9 phot.color;em.opt.U;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

umgPnt atlasSource ATLASDR4 Point source colour U-G (using aperMag3) real 4 mag -0.9999995e9 phot.color;em.opt.U;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

umgPnt atlasSource ATLASDR5 Point source colour U-G (using aperMag3) real 4 mag -0.9999995e9 phot.color;em.opt.U;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

umgPnt atlasSource ATLASv20131127 Point source colour U-G (using aperMag3) real 4 mag -0.9999995e9 PHOT_COLOR

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

umgPnt atlasSource ATLASv20160425 Point source colour U-G (using aperMag3) real 4 mag -0.9999995e9 phot.color;em.opt.U;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

umgPnt atlasSource ATLASv20180209 Point source colour U-G (using aperMag3) real 4 mag -0.9999995e9 phot.color;em.opt.U;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

umgPnt vphasSource VPHASDR3 Point source colour U-G (using aperMag3) real 4 mag -0.9999995e9 phot.color;em.opt.U;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

umgPnt vphasSource VPHASv20160112 Point source colour U-G (using aperMag3) real 4 mag -0.9999995e9 phot.color;em.opt.U;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

umgPnt vphasSource VPHASv20170222 Point source colour U-G (using aperMag3) real 4 mag -0.9999995e9 phot.color;em.opt.U;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

umgPntErr atlasSource ATLASDR1 Error on point source colour U-G real 4 mag -0.9999995e9 stat.error

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

umgPntErr atlasSource ATLASDR2 Error on point source colour U-G real 4 mag -0.9999995e9 stat.error

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

umgPntErr atlasSource ATLASDR3 Error on point source colour U-G real 4 mag -0.9999995e9 stat.error;em.opt.U;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

umgPntErr atlasSource ATLASDR4 Error on point source colour U-G real 4 mag -0.9999995e9 stat.error;em.opt.U;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

umgPntErr atlasSource ATLASDR5 Error on point source colour U-G real 4 mag -0.9999995e9 stat.error;em.opt.U;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

umgPntErr atlasSource ATLASv20131127 Error on point source colour U-G real 4 mag -0.9999995e9 stat.error

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

umgPntErr atlasSource ATLASv20160425 Error on point source colour U-G real 4 mag -0.9999995e9 stat.error;em.opt.U;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

umgPntErr atlasSource ATLASv20180209 Error on point source colour U-G real 4 mag -0.9999995e9 stat.error;em.opt.U;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

umgPntErr vphasSource VPHASDR3 Error on point source colour U-G real 4 mag -0.9999995e9 stat.error;em.opt.U;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

umgPntErr vphasSource VPHASv20160112 Error on point source colour U-G real 4 mag -0.9999995e9 stat.error;em.opt.U;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

umgPntErr vphasSource VPHASv20170222 Error on point source colour U-G real 4 mag -0.9999995e9 stat.error;em.opt.U;em.opt.B

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

uMjd atlasSource ATLASDR3 The mean Modified Julian Day of each detection float 8 day -0.9999995e9 time.epoch

uMjd atlasSource ATLASDR4 The mean Modified Julian Day of each detection float 8 day -0.9999995e9 time.epoch;em.opt.U

uMjd atlasSource ATLASDR5 The mean Modified Julian Day of each detection float 8 day -0.9999995e9 time.epoch;em.opt.U

uMjd atlasSource ATLASv20160425 The mean Modified Julian Day of each detection float 8 day -0.9999995e9 time.epoch

uMjd atlasSource ATLASv20180209 The mean Modified Julian Day of each detection float 8 day -0.9999995e9 time.epoch;em.opt.U

uMjd vphasSource VPHASDR3 The mean Modified Julian Day of each detection float 8 day -0.9999995e9 time.epoch;em.opt.U

uMjd vphasSource VPHASv20160112 The mean Modified Julian Day of each detection float 8 day -0.9999995e9 time.epoch

uMjd vphasSource VPHASv20170222 The mean Modified Julian Day of each detection float 8 day -0.9999995e9 time.epoch

uncorrCatName Multiframe ATLASDR2 the filename of the associated catalogue MEF containing data without illumination correction, eg. server:/path/filename.fits varchar 256 'NONE' meta.id;meta.dataset

uncorrCatName Multiframe ATLASDR3 the filename of the associated catalogue MEF containing data without illumination correction, eg. server:/path/filename.fits varchar 256 'NONE' meta.id;meta.dataset

uncorrCatName Multiframe ATLASDR4 the filename of the associated catalogue MEF containing data without illumination correction, eg. server:/path/filename.fits varchar 256 'NONE' meta.id;meta.dataset

uncorrCatName Multiframe ATLASDR5 the filename of the associated catalogue MEF containing data without illumination correction, eg. server:/path/filename.fits varchar 256 'NONE' meta.id;meta.dataset

uncorrCatName Multiframe ATLASv20160425 the filename of the associated catalogue MEF containing data without illumination correction, eg. server:/path/filename.fits varchar 256 'NONE' meta.id;meta.dataset

uncorrCatName Multiframe ATLASv20180209 the filename of the associated catalogue MEF containing data without illumination correction, eg. server:/path/filename.fits varchar 256 'NONE' meta.id;meta.dataset

uncorrCatName Multiframe VPHASDR3 the filename of the associated catalogue MEF containing data without illumination correction, eg. server:/path/filename.fits varchar 256 'NONE' meta.id;meta.dataset

uncorrCatName Multiframe VPHASv20160112 the filename of the associated catalogue MEF containing data without illumination correction, eg. server:/path/filename.fits varchar 256 'NONE' meta.id;meta.dataset

uncorrCatName Multiframe VPHASv20170222 the filename of the associated catalogue MEF containing data without illumination correction, eg. server:/path/filename.fits varchar 256 'NONE' meta.id;meta.dataset

unfilteredID Multiframe ATLASDR1 UID of original unfiltered frame corresponding to this filtered frame bigint 8 -99999999 obs.field

unfilteredID Multiframe ATLASDR2 UID of original unfiltered frame corresponding to this filtered frame bigint 8 -99999999 obs.field

unfilteredID Multiframe ATLASDR3 UID of original unfiltered frame corresponding to this filtered frame bigint 8 -99999999 obs.field

unfilteredID Multiframe ATLASDR4 UID of original unfiltered frame corresponding to this filtered frame bigint 8 -99999999 obs.field

unfilteredID Multiframe ATLASDR5 UID of original unfiltered frame corresponding to this filtered frame bigint 8 -99999999 obs.field

unfilteredID Multiframe ATLASv20131127 UID of original unfiltered frame corresponding to this filtered frame bigint 8 -99999999 obs.field

unfilteredID Multiframe ATLASv20160425 UID of original unfiltered frame corresponding to this filtered frame bigint 8 -99999999 obs.field

unfilteredID Multiframe ATLASv20180209 UID of original unfiltered frame corresponding to this filtered frame bigint 8 -99999999 obs.field

unfilteredID Multiframe VPHASDR3 UID of original unfiltered frame corresponding to this filtered frame bigint 8 -99999999 obs.field

unfilteredID Multiframe VPHASv20160112 UID of original unfiltered frame corresponding to this filtered frame bigint 8 -99999999 obs.field

unfilteredID Multiframe VPHASv20170222 UID of original unfiltered frame corresponding to this filtered frame bigint 8 -99999999 obs.field

unwise_objid catwise_2020 WISE unWISE catalog object ID varchar 20

uPA atlasSource ATLASDR1 ellipse fit celestial orientation in U real 4 Degrees -0.9999995e9 pos.posAng

uPA atlasSource ATLASDR2 ellipse fit celestial orientation in U real 4 Degrees -0.9999995e9 pos.posAng

uPA atlasSource ATLASDR3 ellipse fit celestial orientation in U real 4 Degrees -0.9999995e9 pos.posAng;em.opt.U

uPA atlasSource ATLASDR4 ellipse fit celestial orientation in U real 4 Degrees -0.9999995e9 pos.posAng;em.opt.U

uPA atlasSource ATLASDR5 ellipse fit celestial orientation in U real 4 Degrees -0.9999995e9 pos.posAng;em.opt.U

uPA atlasSource ATLASv20131127 ellipse fit celestial orientation in U real 4 Degrees -0.9999995e9 pos.posAng

uPA atlasSource ATLASv20160425 ellipse fit celestial orientation in U real 4 Degrees -0.9999995e9 pos.posAng;em.opt.U

uPA atlasSource ATLASv20180209 ellipse fit celestial orientation in U real 4 Degrees -0.9999995e9 pos.posAng;em.opt.U

uPA vphasSource VPHASDR3 ellipse fit celestial orientation in U real 4 Degrees -0.9999995e9 pos.posAng;em.opt.U

uPA vphasSource VPHASv20160112 ellipse fit celestial orientation in U real 4 Degrees -0.9999995e9 pos.posAng;em.opt.U

uPA vphasSource VPHASv20170222 ellipse fit celestial orientation in U real 4 Degrees -0.9999995e9 pos.posAng;em.opt.U

uPetroMag atlasSource ATLASDR1 Extended source U mag (Petrosian) real 4 mag -0.9999995e9 phot.mag

uPetroMag atlasSource ATLASDR2 Extended source U mag (Petrosian) real 4 mag -0.9999995e9 phot.mag

uPetroMag atlasSource ATLASDR3 Extended source U mag (Petrosian) real 4 mag -0.9999995e9 phot.mag;em.opt.U

uPetroMag atlasSource ATLASDR4 Extended source U mag (Petrosian) real 4 mag -0.9999995e9 phot.mag;em.opt.U

uPetroMag atlasSource ATLASDR5 Extended source U mag (Petrosian) real 4 mag -0.9999995e9 phot.mag;em.opt.U

uPetroMag atlasSource ATLASv20131127 Extended source U mag (Petrosian) real 4 mag -0.9999995e9 phot.mag

uPetroMag atlasSource ATLASv20160425 Extended source U mag (Petrosian) real 4 mag -0.9999995e9 phot.mag;em.opt.U

uPetroMag atlasSource ATLASv20180209 Extended source U mag (Petrosian) real 4 mag -0.9999995e9 phot.mag;em.opt.U

uPetroMag vphasSource VPHASDR3 Extended source U mag (Petrosian) real 4 mag -0.9999995e9 phot.mag;em.opt.U

uPetroMag vphasSource VPHASv20160112 Extended source U mag (Petrosian) real 4 mag -0.9999995e9 phot.mag;em.opt.U

uPetroMag vphasSource VPHASv20170222 Extended source U mag (Petrosian) real 4 mag -0.9999995e9 phot.mag;em.opt.U

uPetroMagErr atlasSource ATLASDR1 Error in extended source U mag (Petrosian) real 4 mag -0.9999995e9 stat.error

uPetroMagErr atlasSource ATLASDR2 Error in extended source U mag (Petrosian) real 4 mag -0.9999995e9 stat.error

uPetroMagErr atlasSource ATLASDR3 Error in extended source U mag (Petrosian) real 4 mag -0.9999995e9 stat.error;phot.mag;em.opt.U

uPetroMagErr atlasSource ATLASDR4 Error in extended source U mag (Petrosian) real 4 mag -0.9999995e9 stat.error;phot.mag;em.opt.U

uPetroMagErr atlasSource ATLASDR5 Error in extended source U mag (Petrosian) real 4 mag -0.9999995e9 stat.error;phot.mag;em.opt.U

uPetroMagErr atlasSource ATLASv20131127 Error in extended source U mag (Petrosian) real 4 mag -0.9999995e9 stat.error

uPetroMagErr atlasSource ATLASv20160425 Error in extended source U mag (Petrosian) real 4 mag -0.9999995e9 stat.error;phot.mag;em.opt.U

uPetroMagErr atlasSource ATLASv20180209 Error in extended source U mag (Petrosian) real 4 mag -0.9999995e9 stat.error;phot.mag;em.opt.U

uPetroMagErr vphasSource VPHASDR3 Error in extended source U mag (Petrosian) real 4 mag -0.9999995e9 stat.error;phot.mag;em.opt.U

uPetroMagErr vphasSource VPHASv20160112 Error in extended source U mag (Petrosian) real 4 mag -0.9999995e9 stat.error;phot.mag;em.opt.U

uPetroMagErr vphasSource VPHASv20170222 Error in extended source U mag (Petrosian) real 4 mag -0.9999995e9 stat.error;phot.mag;em.opt.U

uppErrBits atlasSource ATLASDR1 additional WFAU post-processing error bits in U int 4 0 meta.code

Post-processing error quality bit flags assigned to detections in the archive curation procedure for survey data. From least to most significant byte in the 4-byte integer attribute byte 0 (bits 0 to 7) corresponds to information on generally innocuous conditions that are nonetheless potentially significant as regards the integrity of that detection; byte 1 (bits 8 to 15) corresponds to warnings; byte 2 (bits 16 to 23) corresponds to important warnings; and finally byte 3 (bits 24 to 31) corresponds to severe warnings:

Byte Bit Detection quality issue Threshold or bit mask Applies to

Decimal Hexadecimal

0 4 Deblended 16 0x00000010 All VDFS catalogues

0 6 Bad pixel(s) in default aperture 64 0x00000040 All VDFS catalogues

0 7 Low confidence in default aperture 128 0x00000080 All VDFS catalogues

1 12 Lies within detector 16 region of a tile 4096 0x00001000 All catalogues from tiles

2 16 Close to saturated 65536 0x00010000 All VDFS catalogues

2 17 Photometric calibration probably subject to systematic error 131072 0x00020000 VVV only

2 22 Lies within a dither offset of the stacked frame boundary 4194304 0x00400000 All catalogues

2 23 Lies within the underexposed strip (or "ear") of a tile 8388608 0x00800000 All catalogues from tiles

3 24 Lies within an underexposed region of a tile due to missing detector 16777216 0x01000000 All catalogues from tiles

In this way, the higher the error quality bit flag value, the more likely it is that the detection is spurious. The decimal threshold (column 4) gives the minimum value of the quality flag for a detection having the given condition (since other bits in the flag may be set also; the corresponding hexadecimal value, where each digit corresponds to 4 bits in the flag, can be easier to compute when writing SQL queries to test for a given condition). For example, to exclude all Ks band sources in the VHS having any error quality condition other than informational ones, include a predicate ... AND kppErrBits ≤ 255. See the SQL Cookbook and other online pages for further information.

uppErrBits atlasSource ATLASDR2 additional WFAU post-processing error bits in U int 4 0 meta.code

Post-processing error quality bit flags assigned to detections in the archive curation procedure for survey data. From least to most significant byte in the 4-byte integer attribute byte 0 (bits 0 to 7) corresponds to information on generally innocuous conditions that are nonetheless potentially significant as regards the integrity of that detection; byte 1 (bits 8 to 15) corresponds to warnings; byte 2 (bits 16 to 23) corresponds to important warnings; and finally byte 3 (bits 24 to 31) corresponds to severe warnings:

Byte Bit Detection quality issue Threshold or bit mask Applies to

Decimal Hexadecimal

0 4 Deblended 16 0x00000010 All VDFS catalogues

0 6 Bad pixel(s) in default aperture 64 0x00000040 All VDFS catalogues

0 7 Low confidence in default aperture 128 0x00000080 All VDFS catalogues

1 12 Lies within detector 16 region of a tile 4096 0x00001000 All catalogues from tiles

2 16 Close to saturated 65536 0x00010000 All VDFS catalogues

2 17 Photometric calibration probably subject to systematic error 131072 0x00020000 VVV only

2 22 Lies within a dither offset of the stacked frame boundary 4194304 0x00400000 All catalogues

2 23 Lies within the underexposed strip (or "ear") of a tile 8388608 0x00800000 All catalogues from tiles

3 24 Lies within an underexposed region of a tile due to missing detector 16777216 0x01000000 All catalogues from tiles

In this way, the higher the error quality bit flag value, the more likely it is that the detection is spurious. The decimal threshold (column 4) gives the minimum value of the quality flag for a detection having the given condition (since other bits in the flag may be set also; the corresponding hexadecimal value, where each digit corresponds to 4 bits in the flag, can be easier to compute when writing SQL queries to test for a given condition). For example, to exclude all Ks band sources in the VHS having any error quality condition other than informational ones, include a predicate ... AND kppErrBits ≤ 255. See the SQL Cookbook and other online pages for further information.

uppErrBits atlasSource ATLASDR3 additional WFAU post-processing error bits in U int 4 0 meta.code;em.opt.U

Post-processing error quality bit flags assigned to detections in the archive curation procedure for survey data. From least to most significant byte in the 4-byte integer attribute byte 0 (bits 0 to 7) corresponds to information on generally innocuous conditions that are nonetheless potentially significant as regards the integrity of that detection; byte 1 (bits 8 to 15) corresponds to warnings; byte 2 (bits 16 to 23) corresponds to important warnings; and finally byte 3 (bits 24 to 31) corresponds to severe warnings:

Byte Bit Detection quality issue Threshold or bit mask Applies to

Decimal Hexadecimal

0 4 Deblended 16 0x00000010 All VDFS catalogues

0 6 Bad pixel(s) in default aperture 64 0x00000040 All VDFS catalogues

0 7 Low confidence in default aperture 128 0x00000080 All VDFS catalogues

1 12 Lies within detector 16 region of a tile 4096 0x00001000 All catalogues from tiles

2 16 Close to saturated 65536 0x00010000 All VDFS catalogues

2 17 Photometric calibration probably subject to systematic error 131072 0x00020000 VVV only

2 22 Lies within a dither offset of the stacked frame boundary 4194304 0x00400000 All catalogues

2 23 Lies within the underexposed strip (or "ear") of a tile 8388608 0x00800000 All catalogues from tiles

3 24 Lies within an underexposed region of a tile due to missing detector 16777216 0x01000000 All catalogues from tiles

In this way, the higher the error quality bit flag value, the more likely it is that the detection is spurious. The decimal threshold (column 4) gives the minimum value of the quality flag for a detection having the given condition (since other bits in the flag may be set also; the corresponding hexadecimal value, where each digit corresponds to 4 bits in the flag, can be easier to compute when writing SQL queries to test for a given condition). For example, to exclude all Ks band sources in the VHS having any error quality condition other than informational ones, include a predicate ... AND kppErrBits ≤ 255. See the SQL Cookbook and other online pages for further information.

uppErrBits atlasSource ATLASDR4 additional WFAU post-processing error bits in U int 4 0 meta.code;em.opt.U

Post-processing error quality bit flags assigned to detections in the archive curation procedure for survey data. From least to most significant byte in the 4-byte integer attribute byte 0 (bits 0 to 7) corresponds to information on generally innocuous conditions that are nonetheless potentially significant as regards the integrity of that detection; byte 1 (bits 8 to 15) corresponds to warnings; byte 2 (bits 16 to 23) corresponds to important warnings; and finally byte 3 (bits 24 to 31) corresponds to severe warnings:

Byte Bit Detection quality issue Threshold or bit mask Applies to

Decimal Hexadecimal

0 4 Deblended 16 0x00000010 All VDFS catalogues

0 6 Bad pixel(s) in default aperture 64 0x00000040 All VDFS catalogues

0 7 Low confidence in default aperture 128 0x00000080 All VDFS catalogues

1 12 Lies within detector 16 region of a tile 4096 0x00001000 All catalogues from tiles

2 16 Close to saturated 65536 0x00010000 All VDFS catalogues

2 17 Photometric calibration probably subject to systematic error 131072 0x00020000 VVV only

2 22 Lies within a dither offset of the stacked frame boundary 4194304 0x00400000 All catalogues

2 23 Lies within the underexposed strip (or "ear") of a tile 8388608 0x00800000 All catalogues from tiles

3 24 Lies within an underexposed region of a tile due to missing detector 16777216 0x01000000 All catalogues from tiles

In this way, the higher the error quality bit flag value, the more likely it is that the detection is spurious. The decimal threshold (column 4) gives the minimum value of the quality flag for a detection having the given condition (since other bits in the flag may be set also; the corresponding hexadecimal value, where each digit corresponds to 4 bits in the flag, can be easier to compute when writing SQL queries to test for a given condition). For example, to exclude all Ks band sources in the VHS having any error quality condition other than informational ones, include a predicate ... AND kppErrBits ≤ 255. See the SQL Cookbook and other online pages for further information.

uppErrBits atlasSource ATLASDR5 additional WFAU post-processing error bits in U int 4 0 meta.code;em.opt.U

Post-processing error quality bit flags assigned to detections in the archive curation procedure for survey data. From least to most significant byte in the 4-byte integer attribute byte 0 (bits 0 to 7) corresponds to information on generally innocuous conditions that are nonetheless potentially significant as regards the integrity of that detection; byte 1 (bits 8 to 15) corresponds to warnings; byte 2 (bits 16 to 23) corresponds to important warnings; and finally byte 3 (bits 24 to 31) corresponds to severe warnings:

Byte Bit Detection quality issue Threshold or bit mask Applies to

Decimal Hexadecimal

0 4 Deblended 16 0x00000010 All VDFS catalogues

0 6 Bad pixel(s) in default aperture 64 0x00000040 All VDFS catalogues

0 7 Low confidence in default aperture 128 0x00000080 All VDFS catalogues

1 12 Lies within detector 16 region of a tile 4096 0x00001000 All catalogues from tiles

2 16 Close to saturated 65536 0x00010000 All VDFS catalogues

2 17 Photometric calibration probably subject to systematic error 131072 0x00020000 VVV only

2 22 Lies within a dither offset of the stacked frame boundary 4194304 0x00400000 All catalogues

2 23 Lies within the underexposed strip (or "ear") of a tile 8388608 0x00800000 All catalogues from tiles

3 24 Lies within an underexposed region of a tile due to missing detector 16777216 0x01000000 All catalogues from tiles

In this way, the higher the error quality bit flag value, the more likely it is that the detection is spurious. The decimal threshold (column 4) gives the minimum value of the quality flag for a detection having the given condition (since other bits in the flag may be set also; the corresponding hexadecimal value, where each digit corresponds to 4 bits in the flag, can be easier to compute when writing SQL queries to test for a given condition). For example, to exclude all Ks band sources in the VHS having any error quality condition other than informational ones, include a predicate ... AND kppErrBits ≤ 255. See the SQL Cookbook and other online pages for further information.

uppErrBits atlasSource ATLASv20131127 additional WFAU post-processing error bits in U int 4 0 meta.code

Post-processing error quality bit flags assigned to detections in the archive curation procedure for survey data. From least to most significant byte in the 4-byte integer attribute byte 0 (bits 0 to 7) corresponds to information on generally innocuous conditions that are nonetheless potentially significant as regards the integrity of that detection; byte 1 (bits 8 to 15) corresponds to warnings; byte 2 (bits 16 to 23) corresponds to important warnings; and finally byte 3 (bits 24 to 31) corresponds to severe warnings:

Byte Bit Detection quality issue Threshold or bit mask Applies to

Decimal Hexadecimal

0 4 Deblended 16 0x00000010 All VDFS catalogues

0 6 Bad pixel(s) in default aperture 64 0x00000040 All VDFS catalogues

0 7 Low confidence in default aperture 128 0x00000080 All VDFS catalogues

1 12 Lies within detector 16 region of a tile 4096 0x00001000 All catalogues from tiles

2 16 Close to saturated 65536 0x00010000 All VDFS catalogues

2 17 Photometric calibration probably subject to systematic error 131072 0x00020000 VVV only

2 22 Lies within a dither offset of the stacked frame boundary 4194304 0x00400000 All catalogues

2 23 Lies within the underexposed strip (or "ear") of a tile 8388608 0x00800000 All catalogues from tiles

3 24 Lies within an underexposed region of a tile due to missing detector 16777216 0x01000000 All catalogues from tiles

In this way, the higher the error quality bit flag value, the more likely it is that the detection is spurious. The decimal threshold (column 4) gives the minimum value of the quality flag for a detection having the given condition (since other bits in the flag may be set also; the corresponding hexadecimal value, where each digit corresponds to 4 bits in the flag, can be easier to compute when writing SQL queries to test for a given condition). For example, to exclude all Ks band sources in the VHS having any error quality condition other than informational ones, include a predicate ... AND kppErrBits ≤ 255. See the SQL Cookbook and other online pages for further information.

uppErrBits atlasSource ATLASv20160425 additional WFAU post-processing error bits in U int 4 0 meta.code;em.opt.U

Post-processing error quality bit flags assigned to detections in the archive curation procedure for survey data. From least to most significant byte in the 4-byte integer attribute byte 0 (bits 0 to 7) corresponds to information on generally innocuous conditions that are nonetheless potentially significant as regards the integrity of that detection; byte 1 (bits 8 to 15) corresponds to warnings; byte 2 (bits 16 to 23) corresponds to important warnings; and finally byte 3 (bits 24 to 31) corresponds to severe warnings:

Byte Bit Detection quality issue Threshold or bit mask Applies to

Decimal Hexadecimal

0 4 Deblended 16 0x00000010 All VDFS catalogues

0 6 Bad pixel(s) in default aperture 64 0x00000040 All VDFS catalogues

0 7 Low confidence in default aperture 128 0x00000080 All VDFS catalogues

1 12 Lies within detector 16 region of a tile 4096 0x00001000 All catalogues from tiles

2 16 Close to saturated 65536 0x00010000 All VDFS catalogues

2 17 Photometric calibration probably subject to systematic error 131072 0x00020000 VVV only

2 22 Lies within a dither offset of the stacked frame boundary 4194304 0x00400000 All catalogues

2 23 Lies within the underexposed strip (or "ear") of a tile 8388608 0x00800000 All catalogues from tiles

3 24 Lies within an underexposed region of a tile due to missing detector 16777216 0x01000000 All catalogues from tiles

In this way, the higher the error quality bit flag value, the more likely it is that the detection is spurious. The decimal threshold (column 4) gives the minimum value of the quality flag for a detection having the given condition (since other bits in the flag may be set also; the corresponding hexadecimal value, where each digit corresponds to 4 bits in the flag, can be easier to compute when writing SQL queries to test for a given condition). For example, to exclude all Ks band sources in the VHS having any error quality condition other than informational ones, include a predicate ... AND kppErrBits ≤ 255. See the SQL Cookbook and other online pages for further information.

uppErrBits atlasSource ATLASv20180209 additional WFAU post-processing error bits in U int 4 0 meta.code;em.opt.U

Post-processing error quality bit flags assigned to detections in the archive curation procedure for survey data. From least to most significant byte in the 4-byte integer attribute byte 0 (bits 0 to 7) corresponds to information on generally innocuous conditions that are nonetheless potentially significant as regards the integrity of that detection; byte 1 (bits 8 to 15) corresponds to warnings; byte 2 (bits 16 to 23) corresponds to important warnings; and finally byte 3 (bits 24 to 31) corresponds to severe warnings:

Byte Bit Detection quality issue Threshold or bit mask Applies to

Decimal Hexadecimal

0 4 Deblended 16 0x00000010 All VDFS catalogues

0 6 Bad pixel(s) in default aperture 64 0x00000040 All VDFS catalogues

0 7 Low confidence in default aperture 128 0x00000080 All VDFS catalogues

1 12 Lies within detector 16 region of a tile 4096 0x00001000 All catalogues from tiles

2 16 Close to saturated 65536 0x00010000 All VDFS catalogues

2 17 Photometric calibration probably subject to systematic error 131072 0x00020000 VVV only

2 22 Lies within a dither offset of the stacked frame boundary 4194304 0x00400000 All catalogues

2 23 Lies within the underexposed strip (or "ear") of a tile 8388608 0x00800000 All catalogues from tiles

3 24 Lies within an underexposed region of a tile due to missing detector 16777216 0x01000000 All catalogues from tiles

In this way, the higher the error quality bit flag value, the more likely it is that the detection is spurious. The decimal threshold (column 4) gives the minimum value of the quality flag for a detection having the given condition (since other bits in the flag may be set also; the corresponding hexadecimal value, where each digit corresponds to 4 bits in the flag, can be easier to compute when writing SQL queries to test for a given condition). For example, to exclude all Ks band sources in the VHS having any error quality condition other than informational ones, include a predicate ... AND kppErrBits ≤ 255. See the SQL Cookbook and other online pages for further information.

uppErrBits vphasSource VPHASDR3 additional WFAU post-processing error bits in U int 4 0 meta.code;em.opt.U

Post-processing error quality bit flags assigned to detections in the archive curation procedure for survey data. From least to most significant byte in the 4-byte integer attribute byte 0 (bits 0 to 7) corresponds to information on generally innocuous conditions that are nonetheless potentially significant as regards the integrity of that detection; byte 1 (bits 8 to 15) corresponds to warnings; byte 2 (bits 16 to 23) corresponds to important warnings; and finally byte 3 (bits 24 to 31) corresponds to severe warnings:

Byte Bit Detection quality issue Threshold or bit mask Applies to

Decimal Hexadecimal

0 4 Deblended 16 0x00000010 All VDFS catalogues

0 6 Bad pixel(s) in default aperture 64 0x00000040 All VDFS catalogues

0 7 Low confidence in default aperture 128 0x00000080 All VDFS catalogues

1 12 Lies within detector 16 region of a tile 4096 0x00001000 All catalogues from tiles

2 16 Close to saturated 65536 0x00010000 All VDFS catalogues

2 17 Photometric calibration probably subject to systematic error 131072 0x00020000 VVV only

2 22 Lies within a dither offset of the stacked frame boundary 4194304 0x00400000 All catalogues

2 23 Lies within the underexposed strip (or "ear") of a tile 8388608 0x00800000 All catalogues from tiles

3 24 Lies within an underexposed region of a tile due to missing detector 16777216 0x01000000 All catalogues from tiles

In this way, the higher the error quality bit flag value, the more likely it is that the detection is spurious. The decimal threshold (column 4) gives the minimum value of the quality flag for a detection having the given condition (since other bits in the flag may be set also; the corresponding hexadecimal value, where each digit corresponds to 4 bits in the flag, can be easier to compute when writing SQL queries to test for a given condition). For example, to exclude all Ks band sources in the VHS having any error quality condition other than informational ones, include a predicate ... AND kppErrBits ≤ 255. See the SQL Cookbook and other online pages for further information.

uppErrBits vphasSource VPHASv20160112 additional WFAU post-processing error bits in U int 4 0 meta.code;em.opt.U

Post-processing error quality bit flags assigned to detections in the archive curation procedure for survey data. From least to most significant byte in the 4-byte integer attribute byte 0 (bits 0 to 7) corresponds to information on generally innocuous conditions that are nonetheless potentially significant as regards the integrity of that detection; byte 1 (bits 8 to 15) corresponds to warnings; byte 2 (bits 16 to 23) corresponds to important warnings; and finally byte 3 (bits 24 to 31) corresponds to severe warnings:

Byte Bit Detection quality issue Threshold or bit mask Applies to

Decimal Hexadecimal

0 4 Deblended 16 0x00000010 All VDFS catalogues

0 6 Bad pixel(s) in default aperture 64 0x00000040 All VDFS catalogues

0 7 Low confidence in default aperture 128 0x00000080 All VDFS catalogues

1 12 Lies within detector 16 region of a tile 4096 0x00001000 All catalogues from tiles

2 16 Close to saturated 65536 0x00010000 All VDFS catalogues

2 17 Photometric calibration probably subject to systematic error 131072 0x00020000 VVV only

2 22 Lies within a dither offset of the stacked frame boundary 4194304 0x00400000 All catalogues

2 23 Lies within the underexposed strip (or "ear") of a tile 8388608 0x00800000 All catalogues from tiles

3 24 Lies within an underexposed region of a tile due to missing detector 16777216 0x01000000 All catalogues from tiles

In this way, the higher the error quality bit flag value, the more likely it is that the detection is spurious. The decimal threshold (column 4) gives the minimum value of the quality flag for a detection having the given condition (since other bits in the flag may be set also; the corresponding hexadecimal value, where each digit corresponds to 4 bits in the flag, can be easier to compute when writing SQL queries to test for a given condition). For example, to exclude all Ks band sources in the VHS having any error quality condition other than informational ones, include a predicate ... AND kppErrBits ≤ 255. See the SQL Cookbook and other online pages for further information.

uppErrBits vphasSource VPHASv20170222 additional WFAU post-processing error bits in U int 4 0 meta.code;em.opt.U

Post-processing error quality bit flags assigned to detections in the archive curation procedure for survey data. From least to most significant byte in the 4-byte integer attribute byte 0 (bits 0 to 7) corresponds to information on generally innocuous conditions that are nonetheless potentially significant as regards the integrity of that detection; byte 1 (bits 8 to 15) corresponds to warnings; byte 2 (bits 16 to 23) corresponds to important warnings; and finally byte 3 (bits 24 to 31) corresponds to severe warnings:

Byte Bit Detection quality issue Threshold or bit mask Applies to

Decimal Hexadecimal

0 4 Deblended 16 0x00000010 All VDFS catalogues

0 6 Bad pixel(s) in default aperture 64 0x00000040 All VDFS catalogues

0 7 Low confidence in default aperture 128 0x00000080 All VDFS catalogues

1 12 Lies within detector 16 region of a tile 4096 0x00001000 All catalogues from tiles

2 16 Close to saturated 65536 0x00010000 All VDFS catalogues

2 17 Photometric calibration probably subject to systematic error 131072 0x00020000 VVV only

2 22 Lies within a dither offset of the stacked frame boundary 4194304 0x00400000 All catalogues

2 23 Lies within the underexposed strip (or "ear") of a tile 8388608 0x00800000 All catalogues from tiles

3 24 Lies within an underexposed region of a tile due to missing detector 16777216 0x01000000 All catalogues from tiles

In this way, the higher the error quality bit flag value, the more likely it is that the detection is spurious. The decimal threshold (column 4) gives the minimum value of the quality flag for a detection having the given condition (since other bits in the flag may be set also; the corresponding hexadecimal value, where each digit corresponds to 4 bits in the flag, can be easier to compute when writing SQL queries to test for a given condition). For example, to exclude all Ks band sources in the VHS having any error quality condition other than informational ones, include a predicate ... AND kppErrBits ≤ 255. See the SQL Cookbook and other online pages for further information.

uPsfMag atlasSource ATLASDR1 Point source profile-fitted U mag real 4 mag -0.9999995e9 phot.mag

uPsfMag atlasSource ATLASDR2 Point source profile-fitted U mag real 4 mag -0.9999995e9 phot.mag

uPsfMag atlasSource ATLASDR3 Point source profile-fitted U mag real 4 mag -0.9999995e9 phot.mag;em.opt.U

uPsfMag atlasSource ATLASv20131127 Point source profile-fitted U mag real 4 mag -0.9999995e9 phot.mag

uPsfMag atlasSource ATLASv20160425 Point source profile-fitted U mag real 4 mag -0.9999995e9 phot.mag;em.opt.U

uPsfMag vphasSource VPHASDR3 Point source profile-fitted U mag real 4 mag -0.9999995e9 phot.mag;em.opt.U

uPsfMag vphasSource VPHASv20160112 Point source profile-fitted U mag real 4 mag -0.9999995e9 phot.mag;em.opt.U

uPsfMag vphasSource VPHASv20170222 Point source profile-fitted U mag real 4 mag -0.9999995e9 phot.mag;em.opt.U

uPsfMagErr atlasSource ATLASDR1 Error in point source profile-fitted U mag real 4 mag -0.9999995e9 stat.error

uPsfMagErr atlasSource ATLASDR2 Error in point source profile-fitted U mag real 4 mag -0.9999995e9 stat.error

uPsfMagErr atlasSource ATLASDR3 Error in point source profile-fitted U mag real 4 mag -0.9999995e9 stat.error;phot.mag;em.opt.U

uPsfMagErr atlasSource ATLASv20131127 Error in point source profile-fitted U mag real 4 mag -0.9999995e9 stat.error

uPsfMagErr atlasSource ATLASv20160425 Error in point source profile-fitted U mag real 4 mag -0.9999995e9 stat.error;phot.mag;em.opt.U

uPsfMagErr vphasSource VPHASDR3 Error in point source profile-fitted U mag real 4 mag -0.9999995e9 stat.error;phot.mag;em.opt.U

uPsfMagErr vphasSource VPHASv20160112 Error in point source profile-fitted U mag real 4 mag -0.9999995e9 stat.error;phot.mag;em.opt.U

uPsfMagErr vphasSource VPHASv20170222 Error in point source profile-fitted U mag real 4 mag -0.9999995e9 stat.error;phot.mag;em.opt.U

UR_BULGE mgcGalaxyStruct MGC Bulge (u-r) colour real 4 AB mag -99.9

UR_DISK mgcGalaxyStruct MGC Disk (u-r) colour real 4 AB mag -99.9

UR_TOTAL mgcGalaxyStruct MGC Total (u-r) Colour real 4 AB mag -99.9

use_src twomass_psc, twomass_xsc TWOMASS Use source flag. smallint 2 meta.code

uSeqNum atlasSource ATLASDR1 the running number of the U detection int 4 -99999999 meta.id

uSeqNum atlasSource ATLASDR2 the running number of the U detection int 4 -99999999 meta.id

uSeqNum atlasSource ATLASDR3 the running number of the U detection int 4 -99999999 meta.number;em.opt.U

uSeqNum atlasSource ATLASDR4 the running number of the U detection int 4 -99999999 meta.number;em.opt.U

uSeqNum atlasSource ATLASDR5 the running number of the U detection int 4 -99999999 meta.id;em.opt.U

uSeqNum atlasSource ATLASv20131127 the running number of the U detection int 4 -99999999 meta.id

uSeqNum atlasSource ATLASv20160425 the running number of the U detection int 4 -99999999 meta.number;em.opt.U

uSeqNum atlasSource ATLASv20180209 the running number of the U detection int 4 -99999999 meta.number;em.opt.U

uSeqNum vphasSource VPHASDR3 the running number of the U detection int 4 -99999999 meta.number;em.opt.U

uSeqNum vphasSource VPHASv20160112 the running number of the U detection int 4 -99999999 meta.number;em.opt.U

uSeqNum vphasSource VPHASv20170222 the running number of the U detection int 4 -99999999 meta.number;em.opt.U

uSerMag2D atlasSource ATLASDR1 Extended source U mag (profile-fitted) real 4 mag -0.9999995e9 phot.mag

uSerMag2D atlasSource ATLASDR2 Extended source U mag (profile-fitted) real 4 mag -0.9999995e9 phot.mag

uSerMag2D atlasSource ATLASDR3 Extended source U mag (profile-fitted) real 4 mag -0.9999995e9 phot.mag;em.opt.U

uSerMag2D atlasSource ATLASv20131127 Extended source U mag (profile-fitted) real 4 mag -0.9999995e9 phot.mag

uSerMag2D atlasSource ATLASv20160425 Extended source U mag (profile-fitted) real 4 mag -0.9999995e9 phot.mag;em.opt.U

uSerMag2D vphasSource VPHASDR3 Extended source U mag (profile-fitted) real 4 mag -0.9999995e9 phot.mag;em.opt.U

uSerMag2D vphasSource VPHASv20160112 Extended source U mag (profile-fitted) real 4 mag -0.9999995e9 phot.mag;em.opt.U

uSerMag2D vphasSource VPHASv20170222 Extended source U mag (profile-fitted) real 4 mag -0.9999995e9 phot.mag;em.opt.U

uSerMag2DErr atlasSource ATLASDR1 Error in extended source U mag (profile-fitted) real 4 mag -0.9999995e9 stat.error

uSerMag2DErr atlasSource ATLASDR2 Error in extended source U mag (profile-fitted) real 4 mag -0.9999995e9 stat.error

uSerMag2DErr atlasSource ATLASDR3 Error in extended source U mag (profile-fitted) real 4 mag -0.9999995e9 stat.error;phot.mag;em.opt.U

uSerMag2DErr atlasSource ATLASv20131127 Error in extended source U mag (profile-fitted) real 4 mag -0.9999995e9 stat.error

uSerMag2DErr atlasSource ATLASv20160425 Error in extended source U mag (profile-fitted) real 4 mag -0.9999995e9 stat.error;phot.mag;em.opt.U

uSerMag2DErr vphasSource VPHASDR3 Error in extended source U mag (profile-fitted) real 4 mag -0.9999995e9 stat.error;phot.mag;em.opt.U

uSerMag2DErr vphasSource VPHASv20160112 Error in extended source U mag (profile-fitted) real 4 mag -0.9999995e9 stat.error;phot.mag;em.opt.U

uSerMag2DErr vphasSource VPHASv20170222 Error in extended source U mag (profile-fitted) real 4 mag -0.9999995e9 stat.error;phot.mag;em.opt.U

ut twomass_scn TWOMASS Universal Time (UT) at beginning of scan. float 8 hr time.epoch

ut twomass_sixx2_scn TWOMASS beginning UT of scan data float 8 hrs

utc Multiframe ATLASDR1 UTC at start {image primary HDU keyword: UTC} real 4 seconds -9.999995e+08

utc Multiframe ATLASDR2 UTC at start {image primary HDU keyword: UTC} real 4 seconds -9.999995e+08

utc Multiframe ATLASDR3 UTC at start {image primary HDU keyword: UTC} real 4 seconds -9.999995e+08

utc Multiframe ATLASDR4 UTC at start {image primary HDU keyword: UTC} real 4 seconds -9.999995e+08

utc Multiframe ATLASDR5 UTC at start {image primary HDU keyword: UTC} real 4 seconds -9.999995e+08

utc Multiframe ATLASv20131127 UTC at start {image primary HDU keyword: UTC} real 4 seconds -9.999995e+08

utc Multiframe ATLASv20160425 UTC at start {image primary HDU keyword: UTC} real 4 seconds -9.999995e+08

utc Multiframe ATLASv20180209 UTC at start {image primary HDU keyword: UTC} real 4 seconds -9.999995e+08

utc Multiframe VPHASDR3 UTC at start {image primary HDU keyword: UTC} real 4 seconds -9.999995e+08

utc Multiframe VPHASv20160112 UTC at start {image primary HDU keyword: UTC} real 4 seconds -9.999995e+08

utc Multiframe VPHASv20170222 UTC at start {image primary HDU keyword: UTC} real 4 seconds -9.999995e+08

UTC_end ravedr5Source RAVE Coordinated Universal Time at end of exposure (insecure) time 5 timestamp time.end

UTC_start ravedr5Source RAVE Coordinated Universal Time at start of exposure (insecure) time 5 timestamp time.start

utDate Multiframe ATLASDR1 UT date when this file was written (MM-DD-YYYY) datetime 8 MM-DD-YYYY 12-31-9999 time.epoch

utDate Multiframe ATLASDR2 UT date when this file was written (MM-DD-YYYY) datetime 8 MM-DD-YYYY 12-31-9999 time.epoch

utDate Multiframe ATLASDR3 UT date when this file was written (MM-DD-YYYY) datetime 8 MM-DD-YYYY 12-31-9999 time.epoch

utDate Multiframe ATLASDR4 UT date when this file was written (MM-DD-YYYY) datetime 8 MM-DD-YYYY 12-31-9999 time.epoch

utDate Multiframe ATLASDR5 UT date when this file was written (MM-DD-YYYY) datetime 8 MM-DD-YYYY 12-31-9999 time.epoch

utDate Multiframe ATLASv20131127 UT date when this file was written (MM-DD-YYYY) datetime 8 MM-DD-YYYY 12-31-9999 time.epoch

utDate Multiframe ATLASv20160425 UT date when this file was written (MM-DD-YYYY) datetime 8 MM-DD-YYYY 12-31-9999 time.epoch

utDate Multiframe ATLASv20180209 UT date when this file was written (MM-DD-YYYY) datetime 8 MM-DD-YYYY 12-31-9999 time.epoch

utDate Multiframe VPHASDR3 UT date when this file was written (MM-DD-YYYY) datetime 8 MM-DD-YYYY 12-31-9999 time.epoch

utDate Multiframe VPHASv20160112 UT date when this file was written (MM-DD-YYYY) datetime 8 MM-DD-YYYY 12-31-9999 time.epoch

utDate Multiframe VPHASv20170222 UT date when this file was written (MM-DD-YYYY) datetime 8 MM-DD-YYYY 12-31-9999 time.epoch

uXi atlasSource ATLASDR1 Offset of U detection from master position (+east/-west) real 4 arcsec -0.9999995e9 pos.eq.ra;arith.diff

When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 1.0 arcseconds is used. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the VHS, you might wish to insist that the offsets in the selected sample are all below 0.5 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want. NB: the master position is the position of the detection in the shortest passband in the set, rather than the ra/dec of the source as stored in source attributes of the same name. The former is used in the pairing process, while the latter is generally the optimally weighted mean position from an astrometric solution or other combinatorial process of all individual detection positions across the available passbands.

uXi atlasSource ATLASDR2 Offset of U detection from master position (+east/-west) real 4 arcsec -0.9999995e9 pos.eq.ra;arith.diff

When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 1.0 arcseconds is used. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the VHS, you might wish to insist that the offsets in the selected sample are all below 0.5 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want. NB: the master position is the position of the detection in the shortest passband in the set, rather than the ra/dec of the source as stored in source attributes of the same name. The former is used in the pairing process, while the latter is generally the optimally weighted mean position from an astrometric solution or other combinatorial process of all individual detection positions across the available passbands.

uXi atlasSource ATLASDR3 Offset of U detection from master position (+east/-west) real 4 arcsec -0.9999995e9 pos.eq.ra;arith.diff;em.opt.U

When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 1.0 arcseconds is used. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the VHS, you might wish to insist that the offsets in the selected sample are all below 0.5 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want. NB: the master position is the position of the detection in the shortest passband in the set, rather than the ra/dec of the source as stored in source attributes of the same name. The former is used in the pairing process, while the latter is generally the optimally weighted mean position from an astrometric solution or other combinatorial process of all individual detection positions across the available passbands.

uXi atlasSource ATLASDR4 Offset of U detection from master position (+east/-west) real 4 arcsec -0.9999995e9 pos.eq.ra;arith.diff;em.opt.U

When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 1.0 arcseconds is used. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the VHS, you might wish to insist that the offsets in the selected sample are all below 0.5 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want. NB: the master position is the position of the detection in the shortest passband in the set, rather than the ra/dec of the source as stored in source attributes of the same name. The former is used in the pairing process, while the latter is generally the optimally weighted mean position from an astrometric solution or other combinatorial process of all individual detection positions across the available passbands.

uXi atlasSource ATLASDR5 Offset of U detection from master position (+east/-west) real 4 arcsec -0.9999995e9 pos.eq.ra;arith.diff;em.opt.U

When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 1.0 arcseconds is used. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the VHS, you might wish to insist that the offsets in the selected sample are all below 0.5 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want. NB: the master position is the position of the detection in the shortest passband in the set, rather than the ra/dec of the source as stored in source attributes of the same name. The former is used in the pairing process, while the latter is generally the optimally weighted mean position from an astrometric solution or other combinatorial process of all individual detection positions across the available passbands.

uXi atlasSource ATLASv20131127 Offset of U detection from master position (+east/-west) real 4 arcsec -0.9999995e9 pos.eq.ra;arith.diff

When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 1.0 arcseconds is used. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the VHS, you might wish to insist that the offsets in the selected sample are all below 0.5 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want. NB: the master position is the position of the detection in the shortest passband in the set, rather than the ra/dec of the source as stored in source attributes of the same name. The former is used in the pairing process, while the latter is generally the optimally weighted mean position from an astrometric solution or other combinatorial process of all individual detection positions across the available passbands.

uXi atlasSource ATLASv20160425 Offset of U detection from master position (+east/-west) real 4 arcsec -0.9999995e9 pos.eq.ra;arith.diff;em.opt.U

When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 1.0 arcseconds is used. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the VHS, you might wish to insist that the offsets in the selected sample are all below 0.5 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want. NB: the master position is the position of the detection in the shortest passband in the set, rather than the ra/dec of the source as stored in source attributes of the same name. The former is used in the pairing process, while the latter is generally the optimally weighted mean position from an astrometric solution or other combinatorial process of all individual detection positions across the available passbands.

uXi atlasSource ATLASv20180209 Offset of U detection from master position (+east/-west) real 4 arcsec -0.9999995e9 pos.eq.ra;arith.diff;em.opt.U

When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 1.0 arcseconds is used. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the VHS, you might wish to insist that the offsets in the selected sample are all below 0.5 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want. NB: the master position is the position of the detection in the shortest passband in the set, rather than the ra/dec of the source as stored in source attributes of the same name. The former is used in the pairing process, while the latter is generally the optimally weighted mean position from an astrometric solution or other combinatorial process of all individual detection positions across the available passbands.

uXi vphasSource VPHASDR3 Offset of U detection from master position (+east/-west) real 4 arcsec -0.9999995e9 pos.eq.ra;arith.diff;em.opt.U

When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 1.0 arcseconds is used. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the VHS, you might wish to insist that the offsets in the selected sample are all below 0.5 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want. NB: the master position is the position of the detection in the shortest passband in the set, rather than the ra/dec of the source as stored in source attributes of the same name. The former is used in the pairing process, while the latter is generally the optimally weighted mean position from an astrometric solution or other combinatorial process of all individual detection positions across the available passbands.

uXi vphasSource VPHASv20160112 Offset of U detection from master position (+east/-west) real 4 arcsec -0.9999995e9 pos.eq.ra;arith.diff;em.opt.U

When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 1.0 arcseconds is used. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the VHS, you might wish to insist that the offsets in the selected sample are all below 0.5 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want. NB: the master position is the position of the detection in the shortest passband in the set, rather than the ra/dec of the source as stored in source attributes of the same name. The former is used in the pairing process, while the latter is generally the optimally weighted mean position from an astrometric solution or other combinatorial process of all individual detection positions across the available passbands.

uXi vphasSource VPHASv20170222 Offset of U detection from master position (+east/-west) real 4 arcsec -0.9999995e9 pos.eq.ra;arith.diff;em.opt.U

When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 1.0 arcseconds is used. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the VHS, you might wish to insist that the offsets in the selected sample are all below 0.5 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want. NB: the master position is the position of the detection in the shortest passband in the set, rather than the ra/dec of the source as stored in source attributes of the same name. The former is used in the pairing process, while the latter is generally the optimally weighted mean position from an astrometric solution or other combinatorial process of all individual detection positions across the available passbands.

WFAU, Institute for Astronomy,
Royal Observatory, Blackford Hill
Edinburgh, EH9 3HJ, UK

osa-support@roe.ac.uk
27/06/2023