I/246ivo://CDS.VizieR/I/246CDSUrban S.E.Corbin T.E.Wycoff G.L.1998-06-08T10:17:19Z1998-06-08T10:17:11ZCDS support team

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

cds-question@unistra.frastrometryproper-motionsastrographic-catalogscatalogsvisible-astronomysurveysastronomical-object-identificationThe U.S. Naval Observatory has completed the compilation of the ACT Reference Catalog, containing 988,758 stars covering the entire sky. The motivation behind the ACT was to provide accurate proper motions for the majority of the stars in the Tycho Catalogue (ESA SP-1200). To do this, positions from new reductions of the Astrographic Catalogue (AC 2000) were combined with those of Tycho. The large epoch span between the two catalogs yields proper motions about an order of magnitude more accurate than those published in the Tycho Catalogue. The astrometric data contained in the ACT Reference Catalog include positions, proper motions and error estimates. These are on the Hipparcos System (J2000.0) for epoch J2000.0. Photometric data (B and V) from Tycho are included. Additionally, cross references to the Tycho, AC 2000, Bonner Durchmusterung (BD), Cordoba Durchmusterung (CD), Cape Durchmusterung (CPD), Henry Draper (HD) and Hipparcos Catalogues are given.U.S. Naval Observatory, Washington D.C. (1997)https://cdsarc.cds.unistra.fr/viz-bin/cat/I/246CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/239 : The Hipparcos and Tycho Catalogues (ESA 1997)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=I/246https://vizier.iucaa.in/viz-bin/VizieR-2?-source=I/246http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=I/246https://vizier.cds.unistra.fr/viz-bin/votable?-source=I/246https://vizier.iucaa.in/viz-bin/votable?-source=I/246http://vizieridia.saao.ac.za/viz-bin/votable?-source=I/246GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table I/246/act (Full ACT catalog, originally split into 48 files, each 30min wide)https://vizier.cds.unistra.fr/viz-bin/conesearch/I/246/act?https://vizier.iucaa.in/viz-bin/conesearch/I/246/act?http://vizieridia.saao.ac.za/viz-bin/conesearch/I/246/act?GETtext/xml+votable180.050000true0.000335833-5.4943644440.005555555555555556Hipparcoshttps://cdsarc.cds.unistra.fr/viz-bin/moc/I/246?format=asciiOpticaldefaultI/246/actFull ACT catalog, originally split into 48 files, each 30min wideBTmag?Blue magnitude from Tycho (T32)magphot.mag;em.opt.BfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRA(ICRS)Right Ascension ICRS, Epoch=J2000.0 (hours)pos.eq.ra;meta.mainindexedDE(ICRS)Declination ICRS, Epoch=J2000.0 (sign)pos.eq.dec;meta.mainindexedpmRAProper Motion in RA, (sec of time/yr)s/yrpos.pm;pos.eq.radoublepmDEProper Motion in Dec, arcsec/yr)arcsec/yrpos.pm;pos.eq.decfloate_RAs?Stand. dev. of RA at Epoch 1991.25 from Tycho (T14)masstat.errorfloatnullablee_DEs?Stand. dev. of Dec at Epoch 1991.25 from Tycho (T15)masstat.errorfloatnullablee_pmRA?Stand. dev. of Proper motion (RA),mas/yrstat.errorfloatnullablee_pmDE?Stand. dev. of Proper motion (DE),mas/yrstat.errorfloatnullableVTmag?Visual magnitude from Tycho (T34)magphot.mag;em.opt.VfloatnullableB-V?Johnson B-V from Tycho (T37)magphot.color;em.opt.B;em.opt.Vfloatnullableflag1*[X] Astrometric Quality flag (T10)meta.notecharflag2*[1-8] Quality flag (T40)meta.notecharflag3*[GN] Known variability flag (T47)meta.code;src.varcharflag4*[UVW] Variability from Tycho (T48)meta.code;src.varcharflag5*[YZ] Duplicity from Tycho (T49)meta.notecharTYCTycho ID, embedded zeros for blanksmeta.id;meta.maincharindexedAC2000AC 2000 Numbermeta.idintBDBD identifier (T54)meta.idcharCDCD identifier (T55)meta.idcharCPDCPD identifier (T56)meta.idcharHD?Henry Draper Number (T53)meta.idintnullableHIP?Hipparcos Number (T31)meta.idintnullableindexed