2.2.6 spase://CDPP/Instrument/AMDA/PioneerVenusOrbiter/Ephemeris Ephemeris PVO Ephemeris 2009-05-20T21:10:14Z PVO spacecraft positions spase://SMWG/Person/Raymond.J.Walker GeneralContact Platform 1978-12-05T07:20:07.282Z 1992-10-08T16:30:39.579 spase://CDPP/Observatory/AMDA/PioneerVenusOrbiter