The fourth U.S. Naval Observatory CCD Astrograph Catalog (UCAC4)ucac4 scsivo://org.gavo.dc/ucac4/q/sThe GAVO DC teamZacharias, N.Finch, C. T.Girard, T. M.Henden, A.Bartlett, J. L.Monet, D. G.Zacharias, M. I.2012-10-17T00:00:00ZGAVO Data Center TeamMönchhofstrasse 12-14, D-69120 Heidelberggavo@ari.uni-heidelberg.de++49 6221 54 1837starssurveysastrometryproper-motions UCAC4 is a compiled, all-sky star catalog covering mainly the 8 to 16
magnitude range in a single bandpass between V and R.
Positional errors are about 15 to 20 mas for stars in the 10 to 14 mag
range. Proper motions have been derived for most of the about 113
million stars utilizing about 140 other star catalogs with significant
epoch difference to the UCAC CCD observations. These data are
supplemented by 2MASS photometric data for about 110 million stars and
5-band (B,V,g,r,i) photometry from the APASS (AAVSO Photometric
All-Sky Survey) for over 50 million stars. UCAC4 also contains error
estimates and various flags. All bright stars not observed with
the astrograph have been added to UCAC4 from a set of Hipparcos and
Tycho-2 stars. Thus UCAC4 should be complete from the brightest stars
to about R=16, with the source of data indicated in flags.http://dc.zah.uni-heidelberg.de/ucac4/q/s/infoIsServedByGAVO Data Center TAP service The UCAC4 release paper (in preparation) should be cited whenever
UCAC data are utilized.http://dc.zah.uni-heidelberg.de/ucac4/q/s/scs.xml?https://dc.zah.uni-heidelberg.de/ucac4/q/s/scs.xml?GETapplication/x-votable+xmlRARight Ascension (ICRS decimal)degpos.eq.rarealDECDeclination (ICRS decimal)degpos.eq.decrealSRSearch radiusdegrealmagaUCAC aperture magnitudemagphot.mag;em.opt.VrealobjtObject typesrc.classintegerucacidUCAC 2 identification number (UCAC4-zzz-nnnnnn)meta.id;meta.maincharresponseformatFile format requested for output.meta.code.mimecharmaxrecMaximum number of records returned. Pass 0 to retrieve service parameters.integerverbExhaustiveness of column selection. VERB=1 only returns the most important columns, VERB=2 selects the columns deemed useful to the average user, VERB=3 returns a table with all available columns.integer180100000true314.99827805555635.26734750.001http://dc.zah.uni-heidelberg.de/ucac4/q/s/formhttps://dc.zah.uni-heidelberg.de/ucac4/q/s/formhttp://dc.zah.uni-heidelberg.de/ucac4/q/s/availabilityhttps://dc.zah.uni-heidelberg.de/ucac4/q/s/availabilityhttp://dc.zah.uni-heidelberg.de/ucac4/q/s/capabilitieshttps://dc.zah.uni-heidelberg.de/ucac4/q/s/capabilitieshttp://dc.zah.uni-heidelberg.de/ucac4/q/s/tableMetadatahttps://dc.zah.uni-heidelberg.de/ucac4/q/s/tableMetadatahttp://dc.zah.uni-heidelberg.de/taphttps://dc.zah.uni-heidelberg.de/tap0/0-1151544 515448.277e-20 5.369e-19http://dc.zah.uni-heidelberg.de/ucac4/q/s/coverageOpticalucac4The fourth U.S. Naval Observatory CCD Astrograph Catalog (UCAC4) UCAC4 is a compiled, all-sky star catalog covering mainly the 8 to 16
magnitude range in a single bandpass between V and R.
Positional errors are about 15 to 20 mas for stars in the 10 to 14 mag
range. Proper motions have been derived for most of the about 113
million stars utilizing about 140 other star catalogs with significant
epoch difference to the UCAC CCD observations. These data are
supplemented by 2MASS photometric data for about 110 million stars and
5-band (B,V,g,r,i) photometry from the APASS (AAVSO Photometric
All-Sky Survey) for over 50 million stars. UCAC4 also contains error
estimates and various flags. All bright stars not observed with
the astrograph have been added to UCAC4 from a set of Hipparcos and
Tycho-2 stars. Thus UCAC4 should be complete from the brightest stars
to about R=16, with the source of data indicated in flags.ucac4.main UCAC4 is a compiled, all-sky star catalog covering mainly the 8 to 16
magnitude range in a single bandpass between V and R.
Positional errors are about 15 to 20 mas for stars in the 10 to 14 mag
range. Proper motions have been derived for most of the about 113
million stars utilizing about 140 other star catalogs with significant
epoch difference to the UCAC CCD observations. These data are
supplemented by 2MASS photometric data for about 110 million stars and
5-band (B,V,g,r,i) photometry from the APASS (AAVSO Photometric
All-Sky Survey) for over 50 million stars. UCAC4 also contains error
estimates and various flags. All bright stars not observed with
the astrograph have been added to UCAC4 from a set of Hipparcos and
Tycho-2 stars. Thus UCAC4 should be complete from the brightest stars
to about R=16, with the source of data indicated in flags.120000000ucacidUCAC 2 identification number (UCAC4-zzz-nnnnnn)meta.id;meta.maincharindexednullableraj2000Right Ascension at epoch J2000.0 (ICRS)degpos.eq.ra;meta.maindoubleindexednullabledej2000Declination at epoch J2000.0 (ICRS)degpos.eq.dec;meta.maindoubleindexednullablemagmUCAC fit model magnitudemagphot.mag;em.opt.VfloatnullablemagaUCAC aperture magnitudemagphot.mag;em.opt.Vfloatindexednullablesigmagerror of UCAC magnitudemagstat.error;phot.mag;em.opt.VfloatnullableobjtObject typesrc.classshortcdfCombined double star flagmeta.code.multipshortsigraStandard error at central epoch in RA (*cos Dec)degstat.error;pos.eq.rafloatnullablesigdecStandard error at central epoch in Decdegstat.error;pos.eq.decfloatnullablena1Total number of CCD images of this starmeta.numbershortnu1Number of CCD images used for this starmeta.numbershortcu1Number of catalogs (epochs) used for proper motionsmeta.numbershortcepraCentral epoch for mean RAyrtime.epochfloatnullablecepdecCentral epoch for mean Decyrtime.epochfloatnullablepmraProper motion in RA*cos(Dec)deg/yrpos.pm;pos.eq.rafloatnullablepmdeProper motion in Decdeg/yrpos.pm;pos.eq.decfloatnullablesigpmrStandard error of proper motion in RA*cos(Dec)deg/yrstat.error;pos.pm;pos.eq.rafloatnullablesigpmdStandard error of proper motion in Decdeg/yrstat.error;pos.pm;pos.eq.decfloatnullablepts_key2MASS unique star identifiermeta.idintnullablemagj2MASS J magnitudemagphot.mag;em.IR.JfloatnullablesigmagjError in 2MASS J magnitudemagstat.error;phot.mag;em.IR.JfloatnullableicqflgjQuality flag for 2MASS J magnitudemagmeta.code;phot.mag;em.IR.Jshortnullablemagh2MASS H magnitudemagphot.mag;em.IR.HfloatnullablesigmaghError in 2MASS H magnitudemagstat.error;phot.mag;em.IR.HfloatnullableicqflghQuality flag for 2MASS H magnitudemagmeta.code;phot.mag;em.IR.Hshortnullablemagk_s2MASS K_s magnitudemagphot.mag;em.IR.Kfloatnullablesigmagk_sError in 2MASS K_s magnitudemagstat.error;phot.mag;em.IR.Kfloatnullableicqflgk_sQuality flag for 2MASS K_s magnitudemagmeta.code;phot.mag;em.IR.KshortnullablemagbB magnitude from APASSmagphot.mag;em.opt.BfloatnullablesigmagbError in B magnitude from APASSmagstat.error;phot.mag;em.opt.BfloatnullablemagvV magnitude from APASSmagphot.mag;em.opt.VfloatnullablesigmagvError in V magnitude from APASSmagstat.error;phot.mag;em.opt.Vfloatnullablemaggg magnitude from APASSmagphot.mag;em.opt.VfloatnullablesigmaggError in g magnitude from APASSmagstat.error;phot.mag;em.opt.Vfloatnullablemagrr magnitude from APASSmagphot.mag;em.opt.RfloatnullablesigmagrError in r magnitude from APASSmagstat.error;phot.mag;em.opt.Rfloatnullablemagii magnitude from APASSmagphot.mag;em.opt.IfloatnullablesigmagiError in i magnitude from APASSmagstat.error;phot.mag;em.opt.IfloatnullablespmflagsYale SPM g and c flagsmeta.code;srcshortnullablesrcflagsSource flags (see note)meta.codeintnullablediam2massObject size from 2MASSdegphys.angSize;srcfloatnullablernmUnique star identification numbermeta.idintzn2Zone number of UCAC2meta.id.partshortnullablern2Running record number along UCAC2 zonemeta.idintnullable