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    <ResourceID>spase://CNES/NumericalData/CDPP-AMDA/Ephemerides/europa-orb-all</ResourceID>
    <ResourceHeader>

      <ResourceName>Europa - 20 min</ResourceName>

      <ReleaseDate>2018-09-07T13:41:29Z</ReleaseDate>

      <Description>Europa orbits Jupiter in just over three and a half days, 

                with an orbital radius of about 670,900 km. With an eccentricity of only 
                0.009, the orbit itself is nearly circular, and the orbital inclination 
                relative to Jupiter's equatorial plane is small, at 0.470°. 
                Like its fellow Galilean satellites, Europa is tidally locked to Jupiter, 
                with one hemisphere of Europa constantly facing Jupiter. Because of this, 
                there is a sub-Jovian point on Europa's surface, from which Jupiter would 
                appear to hang directly overhead. Europa's prime meridian is the line 
                intersecting this point. Research suggests that the tidal locking may not be 
                full, as a non-synchronous rotation has been proposed: Europa spins faster 
                than it orbits, or at least did so in the past. 
                This suggests an asymmetry in internal mass distribution and that a layer of 
                subsurface liquid separates the icy crust from the rocky interior.

The slight eccentricity of Europa's orbit, maintained by the gravitational disturbances from 
the other Galileans, causes Europa's sub-Jovian point to oscillate around a mean position. 
As Europa comes slightly nearer to Jupiter, Jupiter's gravitational attraction increases, 
causing Europa to elongate towards and away from it. As Europa moves slightly away from 
Jupiter, Jupiter's gravitational force decreases, causing Europa to relax back into a more 
spherical shape, and creating tides in its ocean. The orbital eccentricity of Europa is 
continuously pumped by its mean-motion resonance with Io. 
Thus, the tidal flexing kneads Europa's interior and gives it a source of heat, possibly 
allowing its ocean to stay liquid while driving subsurface geological processes.
The ultimate source of this energy is Jupiter's rotation, which is tapped by Io 
through the tides it raises on Jupiter and is transferred to Europa and Ganymede by the 
orbital resonance.</Description>

      <Contact>
        <PersonID>spase://CNES/Person/CDPP-AMDA/NAIF</PersonID>
        <Role>PrincipalInvestigator</Role>
      </Contact>
      <Association>
        <AssociationID>jup-moons-orb</AssociationID>
        <AssociationType>PartOf</AssociationType>
        <Note>Jupiter Moons</Note>
      </Association>
    </ResourceHeader>
    <AccessInformation>

      <RepositoryID>spase://SMWG/Repository/CDPP/AMDA</RepositoryID>
      <Availability>Online</Availability>
      <AccessRights>Open</AccessRights>
      <AccessURL>
        <Name>CDPP/AMDA HAPI Server</Name>

        <URL>https://amda.irap.omp.eu/service/hapi</URL>

        <Style>HAPI</Style>

        <ProductKey>europa-orb-all</ProductKey>

        <Description>Web Service to this product using the HAPI interface.</Description>
      </AccessURL>
      <Format>CSV</Format>

      <Acknowledgement>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.</Acknowledgement>

    </AccessInformation>

    <AccessInformation>

      <RepositoryID>spase://SMWG/Repository/CDPP/AMDA</RepositoryID>
      <Availability>Online</Availability>
      <AccessRights>Open</AccessRights>
      <AccessURL>
        <Name>CDPP/AMDA Web application</Name>

        <URL>https://amda.cdpp.eu</URL>

        <Description>Access to Data via CDPP/AMDA Web application.</Description>
      </AccessURL>
      <Format>CSV</Format>
      <Format>VOTable</Format>
      <Format>CDF</Format>
      <Format>PNG</Format>

      <Acknowledgement>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.</Acknowledgement>

    </AccessInformation>

    <ProviderName>SPICE</ProviderName>
    <InstrumentID>spase://CNES/Instrument/CDPP-AMDA/Ephemerides</InstrumentID>
    <MeasurementType>Ephemeris</MeasurementType>
    <TemporalDescription>
      <TimeSpan>
        <StartDate>1970-01-01T00:00:05Z</StartDate>
        <StopDate>2036-12-31T23:40:04Z</StopDate>
      </TimeSpan>
      <Cadence>PT20M</Cadence>
    </TemporalDescription>
    <ObservedRegion>Jupiter</ObservedRegion>
    <ObservedRegion>Jupiter.Europa</ObservedRegion>
    <Parameter>
      <Name>xyz_jsm</Name>
      <ParameterKey>eur_jup_jsm</ParameterKey>

      <Units>Rj</Units>
      <CoordinateSystem>
        <CoordinateRepresentation>Cartesian</CoordinateRepresentation>
        <CoordinateSystemName>JSM</CoordinateSystemName>
      </CoordinateSystem>
      <RenderingHints>
        <DisplayType>TimeSeries</DisplayType>
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        <Size>3</Size>
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          <Index>1</Index>
          <ParameterKey>eur_jup_jsm(0)</ParameterKey>
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        <Element>
          <Name>y</Name>
          <Index>2</Index>
          <ParameterKey>eur_jup_jsm(1)</ParameterKey>
        </Element>
        <Element>
          <Name>z</Name>
          <Index>3</Index>
          <ParameterKey>eur_jup_jsm(2)</ParameterKey>
        </Element>
      </Structure>
      <Support>
        <SupportQuantity>Positional</SupportQuantity>
      </Support>
    </Parameter>
    <Parameter>
      <Name>xyz_jso</Name>
      <ParameterKey>eur_jup_jso</ParameterKey>

      <Units>Rj</Units>
      <CoordinateSystem>
        <CoordinateRepresentation>Cartesian</CoordinateRepresentation>
        <CoordinateSystemName>JSO</CoordinateSystemName>
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        <Size>3</Size>
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          <Name>x</Name>
          <Index>1</Index>

          <ParameterKey>eur_jup_jso(0)</ParameterKey>

        </Element>
        <Element>
          <Name>y</Name>
          <Index>2</Index>
          <ParameterKey>eur_jup_jso(1)</ParameterKey>
        </Element>
        <Element>
          <Name>z</Name>
          <Index>3</Index>
          <ParameterKey>eur_jup_jso(2)</ParameterKey>
        </Element>
      </Structure>
      <Support>
        <SupportQuantity>Positional</SupportQuantity>
      </Support>
    </Parameter>
    <Parameter>
      <Name>xyz_IAU_jupiter</Name>
      <ParameterKey>eur_jup_xyz</ParameterKey>

      <Units>Rj</Units>
      <RenderingHints>
        <DisplayType>TimeSeries</DisplayType>
      </RenderingHints>
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        <Size>3</Size>
        <Element>
          <Name>x</Name>
          <Index>1</Index>
          <ParameterKey>eur_jup_xyz(0)</ParameterKey>
        </Element>
        <Element>
          <Name>y</Name>
          <Index>2</Index>
          <ParameterKey>eur_jup_xyz(1)</ParameterKey>
        </Element>
        <Element>
          <Name>z</Name>
          <Index>3</Index>
          <ParameterKey>eur_jup_xyz(2)</ParameterKey>
        </Element>
      </Structure>
      <Support>
        <SupportQuantity>Positional</SupportQuantity>
      </Support>
    </Parameter>
    <Parameter>
      <Name>distance europa-jupiter</Name>
      <ParameterKey>eur_jup_r</ParameterKey>

      <Units>Rj</Units>
      <RenderingHints>
        <DisplayType>TimeSeries</DisplayType>
      </RenderingHints>
      <Support>
        <SupportQuantity>Positional</SupportQuantity>
      </Support>
    </Parameter>
    <Parameter>
      <Name>latitude IAU_jupiter</Name>
      <ParameterKey>eur_jup_lat</ParameterKey>

      <Units>deg</Units>
      <Support>
        <SupportQuantity>Positional</SupportQuantity>
      </Support>
    </Parameter>
    <Parameter>
      <Name>longitude IAU_jupiter</Name>
      <ParameterKey>eur_jup_lon</ParameterKey>

      <Units>deg</Units>
      <Support>
        <SupportQuantity>Positional</SupportQuantity>
      </Support>
    </Parameter>
    <Parameter>
      <Name>mlat</Name>
      <ParameterKey>eur_jup_mlat</ParameterKey>
      <Description>mlat=10.31°xcos(196.61°-lon_iau_west)+lat_iau</Description>
      <Units>deg</Units>
      <Support>
        <SupportQuantity>Positional</SupportQuantity>
      </Support>
    </Parameter>
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