II/385ivo://CDS.VizieR/II/385CDSShanks T.Metcalfe N.Chehade B.Findlay J.R.Irwin M.J.,Gonzalez-Solares E.Lewis J.R.Yoldas A.K.Mann R.G.Read M.A.,Sutorius E.T.W.Voutsinas S.2025-06-02T07:05:25Z2025-05-06T12:47:42ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frsurveysvisible-astronomysloan-photometryThe VLT Survey Telescope ATLAS survey is an optical ugriz survey aiming to cover ~4700deg^2^ of the southern sky to similar depths as the Sloan Digital Sky Survey (SDSS). From reduced images and object catalogues provided by the Cambridge Astronomical Surveys Unit, we first find that the median seeing ranges from 0.8-arcsec FWHM (full width at half-maximum) in i to 1.0-arcsec in u, significantly better than the 1.2-1.5arcsec seeing for SDSS. The 5{sigma} mag limit for stellar sources is r_AB_=22.7 and in all bands these limits are at least as faint as SDSS. SDSS and ATLAS are more equivalent for galaxy photometry except in the z band where ATLAS has significantly higher throughput. We have improved the original ESO magnitude zero-points by comparing m<16 star magnitudes with the AAVSO Photometric All-Sky Survey in gri, also extrapolating into u and z, resulting in zero-points accurate to ~+/-0.02mag. We finally compare star and galaxy number counts in a 250deg^2^ area with SDSS and other count data and find good agreement. ATLAS data products can be retrieved from the ESO Science Archive, while support for survey science analyses is provided by the OmegaCAM Science Archive, operated by the Wide-Field Astronomy Unit in Edinburgh.2015MNRAS.451.4238Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/II/385CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/350 : VLT Survey Telescope ATLAS DR3 (Shanks+, 2015)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=II/385https://vizier.iucaa.in/viz-bin/VizieR-2?-source=II/385http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=II/385https://vizier.cds.unistra.fr/viz-bin/votable?-source=II/385https://vizier.iucaa.in/viz-bin/votable?-source=II/385http://vizieridia.saao.ac.za/viz-bin/votable?-source=II/385GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table II/385/vst_atlas4 (VST-ATLAS DR4 catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/II/385/vst_atlas4?https://vizier.iucaa.in/viz-bin/conesearch/II/385/vst_atlas4?http://vizieridia.saao.ac.za/viz-bin/conesearch/II/385/vst_atlas4?GETtext/xml+votable180.050000true15.01422862718149-38.998370876679370.005555555555555556ESO0/0-11 6/2.1405905346066806e-19 2.393642124494231e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/II/385?format=asciiOpticaldefaultII/385/vst_atlas4VST-ATLAS DR4 catalogSrcIDUID of this merged detection as assigned by merge algorithm (SOURCEID)meta.id;meta.mainindexedRell? 1-b/a, where a/b=semi-major/minor axes in R (RELL)src.ellipticity;em.opt.RfloatnullableRAJ2000Celestial Right Ascension (J2000) (RA2000)degpos.eq.ra;meta.mainDEJ2000Celestial Declination (J2000) (DEC2000)degpos.eq.dec;meta.mainNameIAU Name (not unique) (IAUNAME)meta.idcharcuEventIdUID of curation event giving rise to this record (CUEVENTID)meta.bibintFrameIDUID of the set of frames that this merged source comes from (FRAMESETID)meta.bibpriOrSecSeam code for a unique (=0) or duplicated (!=0) source (PRIORSEC)meta.codeU-Gpnt? Point source colour U-G (using aperMag3) (UMGPNT)magphot.color;em.opt.U;em.opt.Bdoublenullablee_U-Gpnt? Error on point source colour U-G (UMGPNTERR)magstat.error;em.opt.U;em.opt.BdoublenullableG-Rpnt? Point source colour G-R (using aperMag3) (GMRPNT)magphot.color;em.opt.B;em.opt.Rdoublenullablee_G-Rpnt? Error on point source colour G-R (GMRPNTERR)magstat.error;em.opt.B;em.opt.RdoublenullableR-Ipnt? Point source colour R-I (using aperMag3) (RMIPNT)phot.color;em.opt.R;em.opt.Idoublenullablee_R-Ipnt? Error on point source colour R-I (RMIPNTERR)stat.error;em.opt.R;em.opt.IdoublenullableI-Zpnt? Point source colour I-Z (using aperMag3) (IMZPNT)phot.color;em.opt.I;em.opt.Idoublenullablee_I-Zpnt? Error on point source colour I-Z (IMZPNTERR)stat.error;em.opt.I;em.opt.IdoublenullableU-Gext? Extended source colour U-G (using aperMagNoAperCorr3) (UMGEXT)magphot.color;em.opt.U;em.opt.Bdoublenullablee_U-Gext? Error on extended source colour U-G (UMGEXTERR)magstat.error;em.opt.U;em.opt.BdoublenullableG-Rext? Extended source colour G-R (using aperMagNoAperCorr3) (GMREXT)magphot.color;em.opt.B;em.opt.Rdoublenullablee_G-Rext? Error on extended source colour G-R (GMREXTERR)magstat.error;em.opt.B;em.opt.RdoublenullableR-Iext? Extended source colour R-I (using aperMagNoAperCorr3) (RMIEXT)phot.color;em.opt.R;em.opt.Idoublenullablee_R-Iext? Error on extended source colour R-I (RMIEXTERR)stat.error;em.opt.R;em.opt.IdoublenullableI-Zext? Extended source colour I-Z (using aperMagNoAperCorr3) (IMZEXT)magphot.color;em.opt.I;em.opt.Idoublenullablee_I-Zext? Error on extended source colour I-Z (IMZEXTERR)magstat.error;em.opt.I;em.opt.IdoublenullableMstatMerged N(0,1) stellarness-of-profile statistic (MERGEDCLASSSTAT)statdoubleMclass[-3/-1]? Class flag (MERGEDCLASS) (1)meta.codeintnullablepStarProbability that the source is a star (PSTAR)stat.probabilitydoublepGalProbability that the source is a galaxy (PGALAXY)stat.probabilitydoublepNoiseProbability that the source is noise (PNOISE)stat.probabilitydoubleE(B-V)The galactic dust extinction value measured from the Schlegel maps. (EBV)phys.absorption.galfloatUpmag? Extended source U magnitude (Petrosian) (UPETROMAG)magphot.mag;em.opt.Ufloatnullablee_Upmag? Error in extended source U magnitude (Petrosian) (UPETROMAGERR)magstat.error;phot.mag;em.opt.UdoublenullableUkmag? Extended source U magnitude (Kron) (UKRONMAG)magphot.mag;em.opt.Ufloatnullablee_Ukmag? Error in extended source U magnitude (Kron) (UKRONMAGERR)magstat.error;phot.magdoublenullableUap3? Default point source U aperture corrected magnitude (2.0 arcsec diameter) (UAPERMAG3)magphot.mag;em.opt.Ufloatnullableindexede_Uap3? Error in default point source u aperture corrected magnitude (2.0 arcsec diameter) (UAPERMAG3ERR)magstat.error;phot.mag;em.opt.UdoublenullableUap6? Point source U aperture corrected magnitude (5.7 arcsec aperture diameter) (UAPERMAG6)magphot.mag;em.opt.Ufloatnullablee_Uap6? Error in point source u aperture corrected magnitude (5.7 arcsec aperture diameter) (UAPERMAG6ERR)magstat.error;phot.mag;em.opt.UdoublenullableUapc3? Default extended source U aperture corrected magnitude (2.0 arcsec diameter) (UAPERMAGNOAPERCORR3)magphot.mag;em.opt.UfloatnullableUapc6? Extended source U aperture magnitude (5.7 arcsec aperture diameter) (UAPERMAGNOAPERCORR6)magphot.mag;em.opt.UfloatnullableUamaj? Seeing corrected half-light, semi-major axis in U band (UHLCORSMJRADAS)arcsecphys.angSize;em.opt.UfloatnullableUell? 1-b/a, where a/b=semi-major/minor axes in U (UELL)src.ellipticity;em.opt.UfloatnullableUclassSt? N(0,1) stellarness-of-profile statistic in U (UCLASSSTAT)stat;em.opt.UdoublenullableUxi? Offset of U detection from master position (+east/-west) (UXI)arcsecpos.eq.dec;arith.difffloatnullableUeta? Offset of U detection from master position (+north/-south) (UETA)arcsecpos.eq.dec;arith.diff;em.opt.UfloatnullableGpmag? Extended source G magnitude (Petrosian) (GPETROMAG)magphot.mag;em.opt.Bfloatnullablee_Gpmag? Error in extended source G magnitude (Petrosian) (GPETROMAGERR)magstat.error;phot.mag;em.opt.BdoublenullableGkmag? Extended source G magnitude (Kron) (GKRONMAG)magphot.mag;em.opt.Rfloatnullablee_Gkmag? Error in extended source G magnitude (Kron) (GKRONMAGERR)magstat.error;phot.magdoublenullableGap3? Default point source G aperture corrected magnitude (2.0 arcsec diameter) (GAPERMAG3)magphot.mag;em.opt.Bfloatnullablee_Gap3? Error in default point source g aperture corrected magnitude (2.0 arcsec diameter) (GAPERMAG3ERR)magstat.error;phot.mag;em.opt.BdoublenullableGap6? Point source G aperture corrected magnitude (5.7 arcsec aperture diameter) (GAPERMAG6)magphot.mag;em.opt.Bfloatnullablee_Gap6? Error in point source g aperture corrected magnitude (5.7 arcsec aperture diameter) (GAPERMAG6ERR)magstat.error;phot.mag;em.opt.BdoublenullableGapc3? Default extended source G aperture corrected magnitude (2.0 arcsec diameter) (GAPERMAGNOAPERCORR3)magphot.mag;em.opt.BfloatnullableGapc4? Extended source G aperture magnitude (2.8 arcsec aperture diameter) (GAPERMAGNOAPERCORR4)phot.mag;em.opt.BfloatnullableGamaj? Seeing corrected half-light, semi-major axis in G band (GHLCORSMJRADAS)phys.angSize;em.opt.BfloatnullableGell? 1-b/a, where a/b=semi-major/minor axes in G (GELL)src.ellipticity;em.opt.BfloatnullableGclassSt? N(0,1) stellarness-of-profile statistic in G (GCLASSSTAT)stat;em.opt.BdoublenullableGxi? Offset of G detection from master position (+east/-west) (GXI)arcsecpos.eq.ra;arith.diff;em.opt.BfloatnullableGeta? Offset of G detection from master position (+north/-south) (GETA)arcsecpos.eq.dec;arith.diff;em.opt.BfloatnullableRpmag? Extended source R magnitude (Petrosian) (RPETROMAG)magphot.mag;em.opt.Rfloatnullablee_Rpmag? Error in extended source R magnitude (Petrosian) (RPETROMAGERR)magstat.error;phot.mag;em.opt.RdoublenullableRkmag? Extended source R magnitude (Kron) (RKRONMAG)magphot.mag;em.opt.Rfloatnullablee_Rkmag? Error in extended source R magnitude (Kron) (RKRONMAGERR)magstat.error;phot.magdoublenullableRap3? Default point source R aperture corrected magnitude (2.0 arcsec diameter) (RAPERMAG3)magphot.mag;em.opt.Rfloatnullableindexede_Rap3? Error in default point source r aperture corrected magnitude (2.0 arcsec diameter) (RAPERMAG3ERR)magstat.error;phot.mag;em.opt.RdoublenullableRap6? Point source R aperture corrected magnitude (5.7 arcsec aperture diameter) (RAPERMAG6)magphot.mag;em.opt.Rfloatnullablee_Rap6? Error in point source r aperture corrected magnitude (5.7 arcsec aperture diameter) (RAPERMAG6ERR)magstat.error;phot.mag;em.opt.RdoublenullableRapc3? Default extended source R aperture corrected magnitude (2.0 arcsec diameter) (RAPERMAGNOAPERCORR3)phot.mag;em.opt.RfloatnullableRapc6? Extended source R aperture magnitude (5.7 arcsec aperture diameter) (RAPERMAGNOAPERCORR6)magphot.mag;em.opt.RfloatnullableRamaj? Seeing corrected half-light, semi-major axis in R band (RHLCORSMJRADAS)arcsecphys.angSize;em.opt.RfloatnullableRclassSt? N(0,1) stellarness-of-profile statistic in R (RCLASSSTAT)stat;em.opt.RdoublenullableRxi? Offset of R detection from master position (+east/-west) (RXI)arcsecpos.eq.ra;arith.diff;em.opt.RfloatnullableReta? Offset of R detection from master position (+north/-south) (RETA)arcsecpos.eq.dec;arith.diff;em.opt.RfloatnullableIpmag? Extended source I magnitude (Petrosian) (IPETROMAG)magphot.mag;em.opt.Ifloatnullablee_Ipmag? Error in extended source I magnitude (Petrosian) (IPETROMAGERR)magstat.error;phot.mag;em.opt.IdoublenullableIkmag? Extended source I magnitude (Kron) (IKRONMAG)magphot.mag;em.opt.Ifloatnullablee_Ikmag? Error in extended source I magnitude (Kron) (IKRONMAGERR)magstat.error;phot.magdoublenullableIap3? Default point source I aperture corrected magnitude (2.0 arcsec diameter) (IAPERMAG3)magphot.mag;em.opt.Ifloatnullableindexede_Iap3? Error in default point source i aperture corrected magnitude (2.0 arcsec diameter) (IAPERMAG3ERR)magstat.error;phot.mag;em.opt.IdoublenullableIap6? Point source I aperture corrected magnitude (5.7 arcsec aperture diameter) (IAPERMAG6)magphot.mag;em.opt.Ifloatnullablee_Iap6? Error in point source i aperture corrected magnitude (5.7 arcsec aperture diameter) (IAPERMAG6ERR)magstat.error;phot.mag;em.opt.IdoublenullableIapc3? Default extended source I aperture corrected magnitude (2.0 arcsec diameter) (IAPERMAGNOAPERCORR3)magphot.mag;em.opt.IfloatnullableIapc6? Extended source I aperture magnitude (5.7 arcsec aperture diameter) (IAPERMAGNOAPERCORR6)magphot.mag;em.opt.IfloatnullableIamaj? Seeing corrected half-light, semi-major axis in I band (IHLCORSMJRADAS)arcsecphys.angSize;em.opt.IfloatnullableIell? 1-b/a, where a/b=semi-major/minor axes in I (IELL)src.ellipticity;em.opt.IfloatnullableIclassSt? N(0,1) stellarness-of-profile statistic in I (ICLASSSTAT)stat;em.opt.IdoublenullableIxi? Offset of I detection from master position (+east/-west) (IXI)arcsecpos.eq.ra;arith.diff;em.opt.IfloatnullableIeta? Offset of I detection from master position (+north/-south) (IETA)arcsecpos.eq.dec;arith.diff;em.opt.IfloatnullableZpmag? Extended source Z magnitude (Petrosian) (ZPETROMAG)magphot.mag;em.opt.Ifloatnullablee_Zpmag? Error in extended source Z magnitude (Petrosian) (ZPETROMAGERR)magstat.error;phot.mag;em.opt.IdoublenullableZkmag? Extended source Z magnitude (Kron) (ZKRONMAG)magphot.mag;em.opt.Ifloatnullablee_Zkmag? Error in extended source Z magnitude (Kron) (ZKRONMAGERR)magstat.error;phot.magdoublenullableZap3? Default point source Z aperture corrected magnitude (2.0 arcsec diameter) (ZAPERMAG3)magphot.mag;em.opt.Ifloatnullableindexede_Zap3? Error in default point source z aperture corrected magnitude (2.0 arcsec diameter) (ZAPERMAG3ERR)magstat.error;phot.mag;em.opt.IdoublenullableZap6? Point source Z aperture corrected magnitude (5.7 arcsec aperture diameter) (ZAPERMAG6)magphot.mag;em.opt.Ifloatnullablee_Zap6? Error in point source z aperture corrected magnitude (5.7 arcsec aperture diameter) (ZAPERMAG6ERR)magstat.error;phot.mag;em.opt.IdoublenullableZapc3? Default extended source Z aperture corrected magnitude (2.0 arcsec diameter) (ZAPERMAGNOAPERCORR3)magphot.mag;em.opt.IfloatnullableZapc6? Extended source Z aperture magnitude (5.7 arcsec aperture diameter) (ZAPERMAGNOAPERCORR6)phot.mag;em.opt.IfloatnullableZamaj? Seeing corrected half-light, semi-major axis in Z band (ZHLCORSMJRADAS)arcsecphys.angSize;em.opt.IfloatnullableZell? 1-b/a, where a/b=semi-major/minor axes in Z (ZELL)src.ellipticity;em.opt.IfloatnullableZxi? Offset of Z detection from master position (+east/-west) (ZXI)arcsecpos.eq.ra;arith.diff;em.opt.IfloatnullableZeta? Offset of Z detection from master position (+north/-south) (ZETA)arcsecpos.eq.dec;arith.diff;em.opt.IfloatnullablePrim[0/1] Primary source 1; secondary source 0 (PRIMARY_SOURCE)meta.codeint