Version Number for this message content description Message contains an Orbit Parameter Message in CCSDS or another format Descriptor of the type / kind of the contents of the OPM. E.g. state vector, Keplerian elements, maneuvers, matrix Identifies the mode of the stream of messages as either Real-time, Replay, Simulator, or Test. When true (and known, especially for replay data), indicates the last message in the stream. Time the Navigation Data Message was created. Specifies the activity occurring within the mission Creating agency. E.g. GSFC-FDF, GSOC, JPL, JAXA etc. Spacecraft name Spacecraft identifier Format of the DATA field, KVN: Keyword=Value Notation, XML: eXtensible Markup Language, Raw, or Bin (binary) Orbit Parameter Message contents–see Table 9-125 for reference to CCSDS format