I/322Aivo://CDS.VizieR/I/322ACDSZacharias N.Finch C.T.Girard T.M.Henden A.Bartlett J.L.,Monet D.G.Zacharias M.I.2025-08-18T07:28:00Z2012-11-22T21:26:31ZCDS support team

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

cds-question@unistra.frsurveysastrometryproper-motionsUCAC4 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 also provides a link to the original Hipparcos star number with additional data such as parallax found on a separate data file included in this release. The proper motions of bright stars are based on about 140 catalogs, including Hipparcos and Tycho, as well as all catalogs used for the Tycho-2 proper motion construction. Proper motions of faint stars are based on re-reductions of early epoch SPM data (-90 to about -20 deg Dec) and NPM (PMM scans of early epoch blue plates) for the remainder of the sky. These early epoch SPM data have also been combined with late epoch SPM data to arrive at proper motions partly independent from UCAC4 (Girard et al. 2011AJ....142...15G, Cat. I/320). The NPM data used in UCAC4 are not published. No Schmidt plate data are used in UCAC4. The unpublished plate measure data obtained by StarScan from the AGK2, the Hamburg Zone Astrograph, the USNO Black Birch Astrograph, and the Lick Astrograph have contributed to considerable improvement in proper motions for stars mainly in the 10 to 14 mag range (down to the UCAC limit for Lick data); however, these data do not cover all sky. Recources permitting, USNO plans to release the individual CCD observations (RA,Dec at epoch of each CCD observations) in the future. Please contact nz@usno.navy.mil if you are interested in obtaining this set of about 50 GB data. We will likely request that interested users provide an external disk drive for the data release.2013AJ....145...44Zhttps://cdsarc.cds.unistra.fr/viz-bin/cat/I/322ACatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-tohttp://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/ucac : UCAC home pageI/289 : UCAC2 Catalogue (Zacharias+ 2004)I/315 : UCAC3 Catalogue (Zacharias+ 2009)I/247 : The AC2000 Catalogue (Urban+ 1997)I/259 : The Tycho-2 Catalogue (Hog+ 2000)I/264 : Sixth Catalogue of Fundamental Stars (FK6) (Wielen+ 2000)I/277 : SPM Catalog 2.0 (Platais+ 1998)I/317 : The PPMXL Catalog (Roeser+ 2010)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)VII/242 : LEDA galaxies with DENIS measurements catalog (Paturel+, 2005)VII/248 : Quasars and Active Galactic Nuclei (12th Ed.) (Veron+ 2006)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=I/322Ahttps://vizier.iucaa.in/viz-bin/VizieR-2?-source=I/322Ahttp://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=I/322Ahttps://vizier.cds.unistra.fr/viz-bin/votable?-source=I/322Ahttps://vizier.iucaa.in/viz-bin/votable?-source=I/322Ahttp://vizieridia.saao.ac.za/viz-bin/votable?-source=I/322AGETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table I/322A/out (UCAC4 output (out of 113780093 stars))https://vizier.cds.unistra.fr/viz-bin/conesearch/I/322A/out?https://vizier.iucaa.in/viz-bin/conesearch/I/322A/out?http://vizieridia.saao.ac.za/viz-bin/conesearch/I/322A/out?GETtext/xml+votable180.050000true44.87272481.92046840.005555555555555556Hips catalogue for table I/322A/outhttps://hipscat.cds.unistra.fr/HiPSCatService/I/322A/out0/0-11 6/8.650015785639275e-20 3.4272990383579255e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/I/322A?format=asciidefaultI/322A/outUCAC4 output (out of 113780093 stars)Jmag? 2MASS J magnitude (1.2um)magphot.mag;em.IR.JfloatnullableindexedHmag? 2MASS H magnitude (1.6um)magphot.mag;em.IR.HfloatnullableindexedKmag? 2MASS Ks magnitude (2.2um)magphot.mag;em.IR.Kfloatnullableindexedf_imag[.-] Actual or S/N estimated error (12)meta.codecharUCAC4UCAC4 recommended identifier (ZZZ-NNNNNN) (1)meta.id;meta.maincharprimaryRAJ2000Mean right ascension , Ep=J2000 (2)degpos.eq.ra;meta.maine_RAJ2000Mean error of RAdeg at mean epochmasstat.error;pos.eq.raintDEJ2000Mean declination , Ep=J2000 (2)degpos.eq.dec;meta.maine_DEJ2000Mean error of DEdeg at mean epochmasstat.error;pos.eq.decintePosTotal mean error on position at Ep=J2000 (3)masstat.error;posintEpRACentral epoch for mean RAyrtime.epochfloatEpDECentral epoch for mean Declinationyrtime.epochfloatf.mag? UCAC fit model magnitude (579-642nm) (4)magphot.mag;em.optfloatnullablea.mag? UCAC aperture magnitude (579-642nm) (4)magphot.mag;em.optfloatnullablee_a.mag? Mean error on f.mag and a.mag (5)magstat.errorfloatnullableof[0/9] UCAC4 object classification flag (6)meta.codeintdb[0/36] UCAC4 double star flag (7)meta.codeintNa[0/71] Number of UCAC observations for the starmeta.numberintNu[0/70] Number of used UCAC observations (8)meta.numberintNc[1/38] Number of catalog positions used for pmmeta.numberintpmRA? Proper motion in RA(*cos(Dec)) (9)mas/yrpos.pm;pos.eq.rafloatnullablee_pmRA? Mean error on pmRA (9)mas/yrstat.error;pos.pm;pos.eq.rafloatnullablepmDE? Proper motion in Dec (9)mas/yrpos.pm;pos.eq.decfloatnullablee_pmDE? Mean error on pmDE (9)mas/yrstat.error;pos.pm;pos.eq.decfloatnullableMPOS1[1/182895114] Unique star ID number (10)meta.idlongUCAC2UCAC2 (Cat. I/289) designation (ZZZ-NNNNNN)meta.idcharTycho-2Tycho-2 (Cat. I/259) designation (FFFF-NNNNN-N)meta.idchar2Mkey? 2MASS (Cat. II/246) Unique source identifiermeta.id.crossnullablee_Jmag? Mean error (rounded to 0.01mag)magstat.error;phot.magfloatnullableq_Jmag[0,58]? J-band quality-confusion flag (11)meta.code.qualintnullablee_Hmag? Mean error (rounded to 0.01mag)magstat.error;phot.magfloatnullableq_Hmag[0,58]? H-band quality-confusion flag (11)meta.code.qualintnullablee_Kmag? Mean error (rounded to 0.01mag)magstat.error;phot.magfloatnullableq_Kmag[0,58]? K-band quality-confusion flag (11)meta.code.qualintnullableBmag? B magnitude from APASS (12)magphot.mag;em.opt.Bfloatnullableindexede_Bmag? Estimated error on Bmag (12)cmagstat.error;phot.magintnullablef_Bmag[.-] Actual or S/N estimated error (12)meta.codecharVmag? V magnitude from APASS (12)magphot.mag;em.opt.Vfloatnullableindexede_Vmag? Estimated error on Vmag (12)cmagstat.error;phot.magintnullablef_Vmag[.-] Actual or S/N estimated error (12)meta.codechargmag? g magnitude from APASS (12)magphot.mag;em.opt.Rfloatnullablee_gmag? Estimated error on gmag (12)cmagstat.error;phot.magintnullablef_gmag[.-] Actual or S/N estimated error (12)meta.codecharrmag? r magnitude from APASS (12)magphot.mag;em.opt.Rfloatnullablee_rmag? Estimated error on rmag (12)cmagstat.error;phot.magintnullablef_rmag[.-] Actual or S/N estimated error (12)meta.codecharimag? i magnitude from APASS (12)magphot.mag;em.opt.Ifloatnullablee_imag? Estimated error on imag (12)cmagstat.error;phot.magintnullableg[0,3] g-flag from SPM (13)meta.codeintc[0,7] c-flag from SPM (14)meta.codeintH[0/9] Hipparcos/Tycho flag (15)meta.codeintA[0/8] AC2000 flag (16)meta.codeintb[0/8] AGK2 Bonn match flag (16)meta.codeinth[0/8] AGK2 Hamburg match flag (16)meta.codeintZ[0/8] Zone astrographic match flag (16)meta.codeintB[0/8] Black Birch match flag (16)meta.codeintL[0/8] Lick Astrographic match flag (16)meta.codeintN[0/8] NPM Lick match flag (16)meta.codeintS[0/8] SPM Lick match flag (16)meta.codeintLEDALEDA I-band galaxy match (17)log(6arcsec)phys.angSizeint2MX2MASX K-band match (18)arcsecphys.angSize;srcint