J/AJ/163/241ivo://CDS.VizieR/J/AJ/163/241doi:10.26093/cds/vizier.51630241CDSBrozovic M.Jacobson R.A.2022-11-09T05:56:41Z2022-10-06T12:06:37ZCDS support team

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

cds-question@unistra.frsolar-systemsolar-system-planetsWe report on an ephemerides update for the irregular satellites of Uranus and Neptune, including Nereid. Our data set contains ground-based and Voyager 2 position measurements of the satellites. Some of the new observations were reduced with respect to the GAIA star catalog and represent high-quality, modern astrometry. The orbital fits are based on the numerically integrated equations of motion. We summarized results in terms of state vectors, orbital uncertainties, and mean elements. A large number of the irregulars have not been followed up in over a decade, and our study shows that their orbits still contain significant uncertainties.2022AJ....163..241Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/163/241CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+AS/136/445 : CCD observations of Nereid (Veiga+, 1999)J/A+A/580/A76 : Positions of satellites of giant planets (Gomes-Junior+, 2015)J/AJ/155/184 : Irregular planet. satellites colors&shapes (Graykowski+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/163/241https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/163/241http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/163/241https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/163/241https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/163/241http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/163/241GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/AJ/163/241/table5Residual statistics for the irregular satellites of UranusrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSatObserved satellitemeta.id;meta.maincharRefObservations reference (1)meta.ref;pos.frame;obscharObsObserving site codeobs.fieldcharNRA[1/62] Number of RA measurementsmeta.numberintrmsRA[0.033/3.626] Root-mean-square of the residuals in RAmasstat.fit.residual;pos.eq.rafloatNDE[1/62] Number of Dec measurementsmeta.numberintrmsDE[0.024/2.174] Root-mean-square of the residuals in DEmasstat.fit.residual;pos.eq.decfloatJ/AJ/163/241/table7Residual statistics for the irregular satellites of NeptunerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSatObserved satellitemeta.id;meta.maincharRefObservations referencemeta.ref;pos.frame;obscharObsObserving site codeobs.fieldcharNRA[2/16] Number of RA measurementsmeta.numberintrmsRA[0.072/1.066] Root-mean-square of the residuals in RAmasstat.fit.residual;pos.eq.rafloatNDE[2/16] Number of Dec measurementsmeta.numberintrmsDE[0.035/1.132] Root-mean-square of the residuals in DEmasstat.fit.residual;pos.eq.decfloat