J/A+A/488/361ivo://CDS.VizieR/J/A+A/488/361doi:10.26093/cds/vizier.34880361CDSWillner K.Oberst J.Waehlisch M.Matz K-D.Hoffmann H.Roatsch T.,Jaumann R.Mertens V.2008-10-19T07:30:58Z2008-10-19T07:27:37ZCDS support team

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

cds-question@unistra.frsolar-system-planetsastrometryNew astrometric measurements for Phobos are reported on the basis of 69 SRC (Super Resolution Channel) images obtained during 28 Mars Express Phobos flybys executed between 2004 and 2007. The measurements have been made using a newly developed technique which involves positional measurements of surface control points and verification of camera pointing by background stars. The astrometric positions are in excellent agreement with currently available Phobos orbit models. However, we find remaining systematic offsets of 1.5-2.6km, with Phobos ahead of the predicted position along its track. Our observations will be a basis for further improvements in the Phobos ephemeris. The methods we have developed will be useful for astrometric tracking of planetary or asteroidal targets and spacecraft optical navigation in future planetary missions.2008A&A...488..361Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/488/361CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/488/361https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/488/361http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/488/361https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/488/361https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/488/361http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/488/361GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/488/361/tablea2 (Astrometric observations of Phobos with respect to Mars Express spacecraft position)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/488/361/tablea2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/488/361/tablea2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/488/361/tablea2?GETtext/xml+votable180.050000true128.1826-32.67340.0055555555555555566/8303 8389 8661 8663 9346 13202 14735 14746 17890 19121 19123 21006 21028 21446 21453 21672-21673 22125 22772-22773 23273 23278 24638 25503 26153 26155 27282-27283 32169 32172 34261 34263 35073 36259 36653 36664 38822 38829 38847 39270 40073 40626 46920 46982https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/488/361?format=asciidefaultJ/A+A/488/361/tablea2Astrometric observations of Phobos with respect to Mars Express spacecraft positionrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintImageImage nameobs.imagecharObs.DateDate of image acquisition/observationtime.epochnullableObs.TimeTime of image acquisition/observationtime.epochnullableRAJ2000Right ascension (J2000.0) wrt spacecraft positiondegpos.eq.ra;meta.mainDEJ2000Declination (J2000.0) wrt spacecraft positiondegpos.eq.dec;meta.mainePosOne sigma error of Right ascension/Declinationdegstat.errordoubleXposX coordinate of Mars Express spacecraft in Mars centered J2000.0 framekmpos.framedoubleYposY coordinate of Mars Express spacecraft in Mars centered J2000.0 framekmpos.framedoubleZposZ coordinate of Mars Express spacecraft in Mars centered J2000.0 framekmpos.framedouble