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B-plane Evolution Under Highly Non-Keplerian Dynamics

Show simple item record Takahashi, Yu Farnocchia, Davide Thompson, Paul Bradley, Nicholas Ardalan, Shadan Bordi, John 2020-03-11T18:46:33Z 2020-03-11T18:46:33Z 2017-02-08
dc.identifier.citation 27th AAS/AIAA Space Flight Mechanics Meeting, San Antonio, Texas, February 5-9, 2017 en_US
dc.identifier.clearanceno CL#17-0201
dc.description.abstract Juno is the second of a series of New Frontiers missions and was launched in 2011. The spacecraft was set en route to Jupiter, and its Jupiter Orbit Insertion occurred on 2016-07-04 after a five-year cruise in deep space. The mission phase just prior to this large maneuver is called approach. As navigation team, we were responsible for precise orbit determination of the Juno spacecraft to ensure a successful orbit insertion. To evaluate the navigation performance we employed the B-plane mapping, where the incoming hyperbolic velocity defines the plane perpendicular to it, and the time to go to hit the plane will directly map into the uncertainties of the target point. The B-plane is a convenient tool when assessing the navigation performance as it is not affected by non-linearities due to the gravitational pull of the targeted body. However, as the Jupiter Orbit Insertion approached we started to realize that the B-plane mapping uncertainties were significantly larger than expected. We found that the B-plane mapping time had tremendous influence on the covariance inflation in the B-plane. Because of the close approach distance during the Jupiter Orbit Insertion and the strong interaction with J2 spherical harmonic coefficient, the Juno dynamics were too far from a Keplerian one assumed for the B-plane mapping. We first discuss the analytical approach of the B-plane mapping uncertainty and perform a numerical analysis to isolate the components of the Juno dynamics that cause the B-plane covariance inflation. en_US
dc.description.sponsorship NASA/JPL en_US
dc.language.iso en_US en_US
dc.publisher Pasadena, CA: Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2017 en_US
dc.title B-plane Evolution Under Highly Non-Keplerian Dynamics en_US
dc.type Preprint en_US

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