Juno Orbit Determination Experience During First Year At Jupiter

The Juno spacecraft successfully inserted into a polar orbit around Jupiter on 5-
July-2016. Since the Jupiter Orbit Insertion (JOI) maneuver, Juno has completed
six orbits around Jupiter. The mission plan at the time of JOI was for Juno to
perform two 53.5-day capture orbits before executing a Period Reduction Maneuver
(PRM) to place the spacecraft into its intended 14-day science orbit. This
maneuver was canceled due to a concern with the propulsion system. As a result,
the Juno spacecraft will remain in its longer orbit period for rest of its mission.
This paper discusses the Navigation Team’s experience: the orbit determination
strategy and how it changed due to the cancellation of the PRM, challenges
fitting the data during perijove, and how we reconstructed the trajectory
during Juno’s first year in orbit.