I/255ivo://CDS.VizieR/I/255CDSLasker B.M.Russel J.N.Jenkner H.2026-04-09T07:57:37Z2002-08-09T11:41:35ZCDS 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 GSC GSC-ACT is a recalibration of GSC1.1 using the ACT (Astrographic Catalog/Tycho, catalog <I/246>) performed by the Project Pluto ("See also" section below). The "plate RMS" values are given at http://www.projectpluto.com/results.txt, with most plates coming in at under .3 arcseconds1990AJ.....99.2019Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/I/255CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-tohttp://gsss.stsci.edu/catalogs/gsc/gsc2/gsc2.htm : GSC pages at STScII/220 : The HST Guide Star Catalog, Version 1.1 (Lasker+ 1992)I/254 : The HST Guide Star Catalog, Version 1.2 (Lasker+ 1992)I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)I/246 : The ACT Reference Catalog (Urban+ 1997)I/250 : The Tycho Reference Catalogue (Hog+ 1998)http://www.projectpluto.com/gsc_act.htm : GSC-ACT Original Descriptionhttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=I/255https://vizier.iucaa.in/viz-bin/VizieR-2?-source=I/255http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=I/255https://vizier.cds.unistra.fr/viz-bin/votable?-source=I/255https://vizier.iucaa.in/viz-bin/votable?-source=I/255http://vizieridia.saao.ac.za/viz-bin/votable?-source=I/255GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table I/255/out (output (out of 25,258,765 positions))https://vizier.cds.unistra.fr/viz-bin/conesearch/I/255/out?https://vizier.iucaa.in/viz-bin/conesearch/I/255/out?http://vizieridia.saao.ac.za/viz-bin/conesearch/I/255/out?GETtext/xml+votable180.050000true45.004660.019790.0055555555555555560/0-11 6/https://cdsarc.cds.unistra.fr/viz-bin/moc/I/255?format=asciidefaultI/255/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