J/A+A/380/727ivo://CDS.VizieR/J/A+A/380/727doi:10.26093/cds/vizier.33800727CDSVienne A.Thuillot W.Veiga C.H.Arlot J.-E.Vieira Martins R.2001-12-28T21:06:45Z2001-12-28T22:06:24ZCDS support team

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

cds-question@unistra.frsolar-system-planetsastrometryThis paper provides an analysis of astrometric measurements of the main Saturnian satellites made thanks to CCD observations performed in 1995 at the Laboratorio Nacional de Astrofisica at Itajuba in Brazil. The astrometric reduction is discussed, especially the small corrections done here, but most of time neglected elsewhere. A catalog of 6006 differential positions has been obtained. They have been compared to different ephemerides, the Vienne & Duriez ephemerides (TASS 1.7, 1995A&A...297..588V, 1997 Cat. <J/A+A/324/366>), the Harper & Taylor (1994A&A...284..619H) ephemerides and the Dourneau (1993A&A...267..292D) ephemerides. These observations provide a large set of modern observations, and appear to be of good precision. This accuracy is needed for future use of these data to improve the dynamical models. These positions are included in the data base NSDC dedicated to the natural satellites (ftp://ftp.bdl.fr/pub/NSDC/saturn/raw_data/position/).2001A&A...380..727Vhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/380/727CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+AS/139/305 : Position of Saturn's satellites (1982-1988) (Veiga+, 1999)J/A+AS/121/65 : 1990-1994 Saturn's satellites astrometry (Harper+ 1997)J/A+AS/136/257 : Saturn's satellites in 1995/97 (Harper+ 1999)J/other/KFNT/15.483 : Positions of Thebe and Amalthea (Ledovskaya+ 1999)J/A+AS/107/559 : Position of Uranian satellites (Veiga+, 1994)J/A+AS/113/557 : Uranian satellites (Veiga+, 1995)J/A+AS/120/107 : 1989-1994 CCD observations of Triton (Veiga+ 1996)J/A+AS/131/291 : 1995-1997 CCD positions of Triton (Veiga+ 1998)J/A+AS/136/445 : CCD observations of Nereid (Veiga+, 1999)J/A+AS/138/247 : Uranian satellites 1995-1998 (Veiga+, 1999)J/A+AS/143/405 : Astrometric observations of Helene (Veiga+, 2000)ftp://ftp.bdl.fr/pub/NSDC/saturn/raw_data/position :https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/380/727https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/380/727http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/380/727https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/380/727https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/380/727http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/380/727GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/380/727/vienneCatalog of astrometric datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintOpp[118] Opposition number, 1=1874 to 118=1995meta.idintOBSUTC date of the observation (year)time.epochTT-UTCTT-UTC (difference Terrestital Time/UTC)stime;arith.difffloatObsUAI observatory code from the Minor Planet Centermeta.id;instr.obstyintRef[301] Reference code of the catalog (301 for the present observations)meta.refintObsType[0/3] Observation type. 0=RA, DE; 1={Delta}RA*cosDE, {Delta}DE; 2={Delta}RA, {Delta}DE; 3=PA, separationmeta.code;obsintObjsSubject satellite, reference satellite (1)meta.refcharf_Obs1[0/1] Flag of presence of the first coordinatemeta.code.errorintf_Obs2[0/1] Flag of presence of the second coordinatemeta.code.errorintObs1First coordinatepos.cartesian;instr.detdoubleObs2Second coordinatepos.cartesian;instr.detdoubleRefSys[0/2] Reference system (2)meta.noteintRefFra[1/2] Reference frame (3)meta.noteintO-C1? Residuals of observations (4)arcsecstat.fit.omcfloatnullableO-C2? Residuals of observations (4)arcsecstat.fit.omcfloatnullableNSatThe number of the satellite used as reference in the computation of o-cmeta.refintNSeriesThe number of the series (5)meta.numberintXpos? Original coordinates in pixelspixpos.cartesian.x;instr.detdoublenullableYpos? Original coordinates in pixelspixpos.cartesian.y;instr.detdoublenullable