I/254ivo://CDS.VizieR/I/254CDSMorrison J.E.Roeser S.McLean B.Bucciarelli B.Lasker B.2025-10-27T13:25:20Z2008-03-28T16:35:03ZCDS support team

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

cds-question@unistra.frsurveysastrometryThe Guide Star Catalog (GSC), which has been constructed to support the operational need of the Hubble Space Telescope contains nearly 19 million objects brighter than sixteenth magnitude, of which more than 15 million are classified as stars. This catalog provides positions and magnitudes for these stars. The original version of this catalog, GSC 1.0, is described in a series of papers: Lasker et al. (1990AJ.....99.2019L); Russell et al. (1990AJ.....99.2059R); and Jenkner et al. (1990AJ.....99.2082J) The reference material for the GSC 1.2 reduction is the "Positions and Proper Motions Catalogue": PPM-North, Roeser S. and Bastian U., 1988, Cat. <I/146> PPM-South, Bastian U. and Roeser S., 1993, Cat. <I/193> PPM-Suppl, Roeser S., Bastian U. and Kuzmin A., 1994, Cat. <I/208> and the Astrographic Catalogue (AC) which was used to remove the mean systematics common to all the plates. The overall rms error of the GSC 1.2 is estimated better than 0.3arcsec The STScI provides the details of the GSC versions ("See also" section below) A binary version of the GSC1.2, with C code for querying, is available in the subdirectory GSC.2001AJ....121.1752Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/I/254CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-tohttp://gsss.stsci.edu/catalogs/gsc/GSC1/gsc12/DESCRIPTION.HTM : GSC 1.2 pageI/220 : The HST Guide Star Catalog, Version 1.1 (Lasker+ 1992)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=I/254https://vizier.iucaa.in/viz-bin/VizieR-2?-source=I/254http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=I/254https://vizier.cds.unistra.fr/viz-bin/votable?-source=I/254https://vizier.iucaa.in/viz-bin/votable?-source=I/254http://vizieridia.saao.ac.za/viz-bin/votable?-source=I/254GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table I/254/out (output (out of 25,258,765 positions))https://vizier.cds.unistra.fr/viz-bin/conesearch/I/254/out?https://vizier.iucaa.in/viz-bin/conesearch/I/254/out?http://vizieridia.saao.ac.za/viz-bin/conesearch/I/254/out?GETtext/xml+votable180.050000true45.004550.019820.005555555555555556Hips catalogue for table I/254/outhttps://hipscat.cds.unistra.fr/HiPSCatService/I/254/out0/0-11 6/https://cdsarc.cds.unistra.fr/viz-bin/moc/I/254?format=asciidefaultI/254/outoutput (out of 25,258,765 positions)GSCGSC designationmeta.id;meta.mainprimaryRAJ2000Right ascension in J2000, epoch of platedegpos.eq.ra;meta.mainDEJ2000Declination in J2000, epoch of platedegpos.eq.dec;meta.mainPosErrMean error on positionarcsecstat.errorfloatPmagphotographic magnitude (see n_Pmag)magphot.mag;em.optfloatindexede_PmagMean error on photographic magnitudemagstat.error;phot.magfloatn_Pmag[0,18] Coded passband for magnitudemeta.noteintClass[0,3] Class of object (0=star; 3=non-stellar)src.classintPlatePlate designationobs.fieldcharEpoch? Epoch of plateyrtime.epochdoublenullableindexedMult[TF] True if multiple object / False otherwisemeta.code.multipcharVersionsGet parameters of that star from all GSC versionsmeta.ref.urlchar