2.4.1 spase://CNES/NumericalData/CDPP-AMDA/Ephemerides/io-orb-all Io 2018-09-07T11:47:12Z Io orbits Jupiter at a distance of 421,700 km from Jupiter's center and 350,000 km from its cloudtops. It is the innermost of the Galilean satellites of Jupiter, its orbit lying between those of Thebe and Europa. Including Jupiter's inner satellites, Io is the fifth moon out from Jupiter. It takes Io about 42.5 hours to complete one orbit around Jupiter. Io is in a 2:1 mean-motion orbital resonance with Europa and a 4:1 mean-motion orbital resonance with Ganymede, completing two orbits of Jupiter for every one orbit completed by Europa, and four orbits for every one completed by Ganymede. This resonance helps maintain Io's orbital eccentricity (0.0041), which in turn provides the primary heating source for its geologic activity. Without this forced eccentricity, Io's orbit would circularize through tidal dissipation, leading to a geologically less active world. Like the other Galilean satellites and the Moon, Io rotates synchronously with its orbital period, keeping one face nearly pointed toward Jupiter. This synchronicity provides the definition for Io's longitude system. Io's prime meridian intersects the equator at the sub-Jovian point. The side of Io that always faces Jupiter is known as the subjovian hemisphere, whereas the side that always faces away is known as the antijovian hemisphere. The side of Io that always faces in the direction that Io travels in its orbit is known as the leading hemisphere, whereas the side that always faces in the opposite direction is known as the trailing hemisphere. spase://CNES/Person/CDPP-AMDA/NAIF PrincipalInvestigator jup-moons-orb PartOf Jupiter Moons spase://SMWG/Repository/CDPP/AMDA Online Open CDPP/AMDA HAPI Server https://amda.irap.omp.eu/service/hapi io-orb-all Web Service to this product using the HAPI interface. CSV Thank you for acknowledging the use of AMDA in publications with wording like "Data analysis was performed with the AMDA science analysis system provided by the Centre de Données de la Physique des Plasmas (CDPP) supported by CNRS, CNES, Observatoire de Paris and Université Paul Sabatier, Toulouse". See the Rules of the road at https://amda.cdpp.eu/help/policy.html . Please acknowledge the Data Providers. spase://SMWG/Repository/CDPP/AMDA Online Open CDPP/AMDA Web application https://amda.cdpp.eu Access to Data via CDPP/AMDA Web application. CSV VOTable CDF PNG Thank you for acknowledging the use of AMDA in publications with wording like "Data analysis was performed with the AMDA science analysis system provided by the Centre de Données de la Physique des Plasmas (CDPP) supported by CNRS, CNES, Observatoire de Paris and Université Paul Sabatier, Toulouse". See the Rules of the road at https://amda.cdpp.eu/help/policy.html . Please acknowledge the Data Providers. SPICE spase://CNES/Instrument/CDPP-AMDA/Ephemerides Ephemeris 1970-01-01T00:00:05Z 2036-12-31T23:40:04Z PT20M Jupiter Jupiter.Io xyz_jsm io_jup_jsm Rj Cartesian JSM TimeSeries 3 x 1 io_jup_jsm(0) y 2 io_jup_jsm(1) z 3 io_jup_jsm(2) Positional xyz_jso io_jup_jso Rj Cartesian JSO TimeSeries 3 x 1 io_jup_jso(0) y 2 io_jup_jso(1) z 3 io_jup_jso(2) Positional xyz_IAU_jupiter io_jup_xyz Rj TimeSeries 3 x 1 io_jup_xyz(0) y 2 io_jup_xyz(1) z 3 io_jup_xyz(2) Positional distance io-jupiter io_jup_r Rj TimeSeries Positional latitude IAU_jupiter io_jup_lat deg Positional longitude IAU_jupiter io_jup_lon deg Positional mlat io_jup_mlat mlat=10.31°xcos(196.61°-lon_iau_west)+lat_iau deg Positional