<?xml version="1.0" encoding="UTF-8"?> <Spase xmlns="http://www.spase-group.org/data/schema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.spase-group.org/data/schema http://amda.irap.omp.eu/public/schemas/spase-2_3_1.xsd"> <Version>2.3.1</Version> <NumericalData> <ResourceID>spase://CNES/NumericalData/CDPP-AMDA/Ephemerides/dione-orb-all</ResourceID> <ResourceHeader> <ResourceName>Dione</ResourceName> <ReleaseDate>2017-10-14T11:46:29Z</ReleaseDate> <Description>Dione orbits Saturn with a semimajor axis about 2% less than that of the Moon. However, reflecting Saturn's greater mass (95 times that of Earth's), Dione's orbital period is one tenth that of the Moon. Dione is currently in a 1:2 mean-motion orbital resonance with moon Enceladus, completing one orbit of Saturn for every two orbits completed by Enceladus. This resonance maintains Enceladus's orbital eccentricity (0.0047), providing a source of heat for Enceladus's extensive geological activity, which shows up most dramatically in its cryovolcanic geyser-like jets. The resonance also maintains a smaller eccentricity in Dione's orbit (0.0022), tidally heating it as well. Dione has two co-orbital, or trojan, moons, Helene and Polydeuces. They are located within Dione's Lagrangian points L4 and L5, 60 degrees ahead of and behind Dione respectively.</Description> <Contact> <PersonID>spase://CNES/Person/NAIF</PersonID> <Role>PrincipalInvestigator</Role> </Contact> <Association> <AssociationID>sat-moons-orb</AssociationID> <AssociationType>PartOf</AssociationType> <Note>Saturn Moons</Note> </Association> </ResourceHeader> <AccessInformation> <RepositoryID>spase://SMWG/Repository/CNES/CDPP-AMDA</RepositoryID> <Availability>Online</Availability> <AccessRights>Open</AccessRights> <AccessURL> <URL>http://amda.cdpp.eu</URL> </AccessURL> <Format>Text.ASCII</Format> </AccessInformation> <ProviderName>SPICE</ProviderName> <InstrumentID>spase://CNES/Instrument/CDPP-AMDA/Ephemerides</InstrumentID> <MeasurementType>Ephemeris</MeasurementType> <TemporalDescription> <TimeSpan> <StartDate>1970-01-01T00:00:00Z</StartDate> <StopDate>2022-12-23T23:19:59Z</StopDate> </TimeSpan> <Cadence>PT20M</Cadence> </TemporalDescription> <ObservedRegion>Saturn</ObservedRegion> <ObservedRegion>Saturn.Dione</ObservedRegion> <Parameter> <Name>distance dione-saturn</Name> <ParameterKey>dio_sat_r</ParameterKey> <Ucd/> <Units>Rs</Units> <RenderingHints> <DisplayType>TimeSeries</DisplayType> </RenderingHints> <Support> <SupportQuantity>Positional</SupportQuantity> </Support> </Parameter> <Parameter> <Name>xyz_ksm</Name> <ParameterKey>dio_sat_ksm</ParameterKey> <Ucd/> <Units>Rs</Units> <CoordinateSystem> <CoordinateRepresentation>Cartesian</CoordinateRepresentation> <CoordinateSystemName>KSM</CoordinateSystemName> </CoordinateSystem> <RenderingHints> <DisplayType>TimeSeries</DisplayType> </RenderingHints> <Structure> <Size>3</Size> <Element> <Name>x</Name> <Index>1</Index> <ParameterKey>dio_sat_ksm(0)</ParameterKey> </Element> <Element> <Name>y</Name> <Index>2</Index> <ParameterKey>dio_sat_ksm(1)</ParameterKey> </Element> <Element> <Name>z</Name> <Index>3</Index> <ParameterKey>dio_sat_ksm(2)</ParameterKey> </Element> </Structure> <Support> <SupportQuantity>Positional</SupportQuantity> </Support> </Parameter> <Parameter> <Name>xyz_kso</Name> <ParameterKey>dio_sat_kso</ParameterKey> <Ucd/> <Units>Rs</Units> <CoordinateSystem> <CoordinateRepresentation>Cartesian</CoordinateRepresentation> <CoordinateSystemName>KSO</CoordinateSystemName> </CoordinateSystem> <RenderingHints> <DisplayType>TimeSeries</DisplayType> </RenderingHints> <Structure> <Size>3</Size> <Element> <Name>x</Name> <Index>1</Index> <ParameterKey>dio_sat_kso(0)</ParameterKey> </Element> <Element> <Name>y</Name> <Index>2</Index> <ParameterKey>dio_sat_kso(1)</ParameterKey> </Element> <Element> <Name>z</Name> <Index>3</Index> <ParameterKey>dio_sat_kso(2)</ParameterKey> </Element> </Structure> <Support> <SupportQuantity>Positional</SupportQuantity> </Support> </Parameter> <Parameter> <Name>xyz_IAU_saturn</Name> <ParameterKey>dio_sat_xyz</ParameterKey> <Ucd/> <Units>Rs</Units> <CoordinateSystem> <CoordinateRepresentation>Cartesian</CoordinateRepresentation> <CoordinateSystemName>IAU_Saturn</CoordinateSystemName> </CoordinateSystem> <RenderingHints> <DisplayType>TimeSeries</DisplayType> </RenderingHints> <Structure> <Size>3</Size> <Element> <Name>x</Name> <Index>1</Index> <ParameterKey>dio_sat_xyz(0)</ParameterKey> </Element> <Element> <Name>y</Name> <Index>2</Index> <ParameterKey>dio_sat_xyz(1)</ParameterKey> </Element> <Element> <Name>z</Name> <Index>3</Index> <ParameterKey>dio_sat_xyz(2)</ParameterKey> </Element> </Structure> <Support> <SupportQuantity>Positional</SupportQuantity> </Support> </Parameter> <Parameter> <Name>latitude IAU_saturn</Name> <ParameterKey>dio_sat_lat</ParameterKey> <Ucd/> <Units>deg</Units> <Support> <SupportQuantity>Positional</SupportQuantity> </Support> </Parameter> <Parameter> <Name>longitude IAU_saturn</Name> <ParameterKey>dio_sat_lon</ParameterKey> <Ucd/> <Units>deg</Units> <Support> <SupportQuantity>Positional</SupportQuantity> </Support> </Parameter> </NumericalData> </Spase>