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Autonomous Navigation performance during The Hartley 2 comet flyby

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dc.contributor.advisor Instrumentation and Photography en_US Abrahamson, Matthew J Kennedy, Brian A. Bhaskaran, Shyam 2012-11-13T23:42:09Z 2012-11-13T23:42:09Z 2012-06-14
dc.identifier.citation SpaceOps 2012, Stockholm, Sweden, June 11-15, 2012 en_US
dc.identifier.clearanceno 12-1904
dc.description.abstract On November 4, 2010, the EPOXI spacecraft performed a 700-km flyby of the comet Hartley 2 as follow-on to the successful 2005 Deep Impact prime mission. EPOXI, an extended mission for the Deep Impact Flyby spacecraft, returned a wealth of visual and infrared data from Hartley 2, marking the fifth time that high-resolution images of a cometary nucleus have been captured by a spacecraft. The highest resolution science return, captured at closest approach to the comet nucleus, was enabled by use of an onboard autonomous navigation system called AutoNav. AutoNav estimates the comet-relative spacecraft trajectory using optical measurements from the Medium Resolution Imager (MRI) and provides this relative position information to the Attitude Determination and Control System (ADCS) for maintaining instrument pointing on the comet. For the EPOXI mission, AutoNav was tasked to enable continuous tracking of a smaller, more active Hartley 2, as compared to Tempel 1, through the full encounter while traveling at a higher velocity. To meet the mission goal of capturing the comet in all MRI science images, position knowledge accuracies of ± 3.5 km (3-σ) cross track and ± 0.3 seconds (3-σ) time of flight were required. A flight-code-in-the-loop Monte Carlo simulation assessed AutoNav’s statistical performance under the Hartley 2 flyby dynamics and determined optimal configuration. The AutoNav performance at Hartley 2 was successful, capturing the comet in all of the MRI images. The maximum residual between observed and predicted comet locations was 20 MRI pixels, primarily influenced by the center of brightness offset from the center of mass in the observations and attitude knowledge errors. This paper discusses the Monte Carlo-based analysis that led to the final AutoNav configuration and a comparison of the predicted performance with the flyby performance. 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, 2012. en_US
dc.subject Autonomous Navigation en_US
dc.subject comet en_US
dc.subject small body en_US
dc.subject flyby en_US
dc.subject optical navigation en_US
dc.title Autonomous Navigation performance during The Hartley 2 comet flyby en_US
dc.type Preprint en_US
dc.subject.NASATaxonomy Statistics and Probability en_US

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