2.4.1 spase://CNES/Instrument/CDPP-AMDA/MGS/Ephemeris Ephemeris MGS Orbit 2017-01-20T21:10:13Z MGS spacecraft positions spase://CNES/Person/CDPP-AMDA/NAIF PrincipalInvestigator Platform Spacecraft position spase://CNES/Observatory/CDPP-AMDA/MGS