I/250ivo://CDS.VizieR/I/250CDSHog E.Kuzmin A.Bastian U.Fabricius C.Kuimov K.,Lindegren L.Makarov V.V.Roeser S.1998-06-08T10:17:40Z1998-06-08T10:17:35ZCDS support team

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

cds-question@unistra.frastrometryproper-motionsastrographic-catalogscatalogsvisible-astronomysurveysastronomical-object-identificationThe Tycho Reference Catalogue (TRC) contains high-quality positions and proper motions for 990182 stars of the Tycho Catalogue. The proper motions were derived from Tycho positions and Astrographic Catalogue positions reduced to the Hipparcos system. The median accuracy of the TRC position components is 40 mas at J1991.25. The median accuracy of the proper motion is about 2.5 mas/yr. Systematic errors are less than about 1.0 mas(/yr). The quality of the proper motions in TRC is assessed by comparison with the Hipparcos and Tycho Catalogues. Comparison with the recent ACT Catalogue which is based on an independent reduction of the same observations as used for constructing the TRC is reported.1998A&A...335L..65Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/I/250CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/220 : The HST Guide Star Catalog (Lasker+ 1992)I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)I/246 : The ACT Reference Catalog (Urban+ 1997)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=I/250https://vizier.iucaa.in/viz-bin/VizieR-2?-source=I/250http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=I/250https://vizier.cds.unistra.fr/viz-bin/votable?-source=I/250https://vizier.iucaa.in/viz-bin/votable?-source=I/250http://vizieridia.saao.ac.za/viz-bin/votable?-source=I/250GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table I/250/catalog (The TRC catalogue)https://vizier.cds.unistra.fr/viz-bin/conesearch/I/250/catalog?https://vizier.iucaa.in/viz-bin/conesearch/I/250/catalog?http://vizieridia.saao.ac.za/viz-bin/conesearch/I/250/catalog?GETtext/xml+votable180.050000true1.125593552.267387870.005555555555555556Hipparcoshttps://cdsarc.cds.unistra.fr/viz-bin/moc/I/250?format=asciiOpticaldefaultI/250/catalogThe TRC cataloguerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTYCID1[1,9537]+= TYCID1 from TYC (1)meta.id;meta.mainintindexedTYCID2[1,12119] TYCID2 from TYC (1)meta.idintindexedTYCID3[1,2] TYCID3 from TYC (1)meta.idintRA(ICRS)Right Ascension, ICRS, at epoch J2000degpos.eq.ra;meta.mainindexedDE(ICRS)Declination, ICRS, at epoch J2000degpos.eq.dec;meta.mainindexedpmRA[-212.7,210.1] prop. mot. in RA * cos(dec)mas/apos.pm;pos.eq.rafloatpmDE[-216.6,210.6] proper motion in Decmas/apos.pm;pos.eq.decfloatepRA[1923.68,1991.25] mean epoch of RA (2)atime.epochfloatepDE[1934.88,1991.25] mean epoch of Dec (2)atime.epochfloate_RAdegs.e. RA * cos(dec), at mean epoch (3)masstat.errorfloate_DEdegs.e. of Dec at mean epoch (3)masstat.errorfloate_pmRA[1.6,24.0] s.e. prop mot in RA * cos(dec)mas/astat.errorfloate_pmDE[1.6,24.1] s.e. of proper motion in Decmas/astat.errorfloatBT[0.312,13.086]? Tycho BT magnitude (4)magphot.mag;em.opt.Bfloatnullablee_BT[0.001,0.3]? s.e. of BT (4)magstat.errorfloatnullableVT[0.283,15]? Tycho VT magnitude (4)magphot.mag;em.opt.Vfloatnullablee_VT[0.001,0.3]? s.e. of VT (4)magstat.errorfloatnullableNum[2,13] Number of positions used (5)meta.numberintq_pm[0,9] quality flag for proper motion (6)meta.code.qualintHD[1,359021]? HD identifier from TYCmeta.idintnullableHIP[1,120404]? Hipparcos number from TYCmeta.idintnullableCCDMCCDM component identifier from TYC (7)meta.idcharPlx[0.52,202.69]? parallax for HIP stars (8)maspos.parallax.trigfloatnullabledupflg[ DS] duplicity flag (9)meta.notecharvarflg[ V] variability flag (10)meta.code;src.varcharACTflg[ TX] ACT flag (11)meta.notechar