J/AJ/167/104ivo://CDS.VizieR/J/AJ/167/104doi:10.26093/cds/vizier.51670104CDSBrozovic M.Jacobson R.A.Park R.S.Descamps P.Berthier J.,Pinilla-Alonso N.Popescu M.Licandro J.2024-11-06T20:19:21Z2024-05-28T07:45:12ZCDS support team

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

cds-question@unistra.frasteroidssolar-systemWe report on the ephemeris development for Menoetius, the satellite of Patroclus. Our data set consisted of ground-based and Hubble Space Telescope relative astrometry, as well as 42 lightcurves from the mutual events seasons in 2007, 2012, and 2017/2018. Our dynamical model included the effects of oblate, nonspherical shapes of the components, and we assumed that Menoetius contained ~22% of the system's mass. We numerically integrated the equations of motion and obtained a set of dynamical parameters that fit the data. We report the fit results in terms of residuals, state vectors, orbital elements and their 1{sigma} uncertainties. The mean osculating semimajor axis is a=692.5{+/-}4.0km, the mean eccentricity is e=0.004{+/-}0.004, and the International Celestial Reference Frame pole direction in R.A. and decl. is R.A=178.0{+/-}0.5deg, {delta}=-74.1{+/-}0.2deg. We determined the siderial orbital period of P=4.282753{+/-}0.000023days. The fit yielded the system GM=0.0950{+/-}0.0012km^3^/s^2^, which, in combination with the system volume determined from the stellar occultation and the assumed volume uncertainty of 20%, suggests a system bulk density of 1.05{+/-}0.21g/cm^3^(1{sigma}). The next season of mutual events starts in February of 2024 and lasts until January of 2025. The Patroclus system is in opposition for the observers on Earth in late September and is suitable for observations of the mutual events with an edge-on geometry in October.2024AJ....167..104Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/167/104CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/311/710 : Faint Jovian satellites ephemerides (Rocher+, 1996)J/A+AS/115/295 : Astrometry of outer Jovian satellites (Hernius+, 1996)J/A+A/383/724 : 1999-2000 CCD observations inner Jovian moons (Kulyk+, 2002)J/A+A/453/349 : CCD positions for 8 Jovian irregular satellites (Veiga, 2006)J/A+A/580/A76 : Positions of satellites of giant planets (Gomes-Junior+, 2015)J/AJ/153/147 : Orbits of Jupiter's irregular satellites (Brozovic+, 2017)J/AJ/163/241 : Residual stats Uranus & Neptune satellites (Brozovic+, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/167/104https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/167/104http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/167/104https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/167/104https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/167/104http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/167/104GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/AJ/167/104/table3Mutual events season 2024 - Superior eventsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateMutual event date (1)time.epochcharStart-TimeMutual event starts (1)time.epochcharEnd-TimeMutual event ends (1)time.epochcharEvent-Max-TimeLargest drop in magnitude occurstime.epochcharEvent(s)Type of the occulting and/or eclipsing event (2)meta.noteJ/AJ/167/104/table4Mutual events season 2024 - Inferior eventsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateMutual event date (1)time.epochcharStart-TimeMutual event starts (1)time.epochcharEnd-TimeMutual event ends (1)time.epochcharEvent-Max-TimeLargest drop in magnitude occurstime.epochcharEvent(s)Type of the occulting and/or eclipsing event (2)meta.note