Record Details

OSIRIS-REx Orbit Determination Covariance Studies at Bennu
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Author and Affiliation:
Antreasian, P. G.(KinetX Aerospace, Inc, Simi Valley, CA, United States);
Moreau, M.(NASA Goddard Space Flight Center, Greenbelt, MD United States);
Jackman, C.(KinetX Aerospace, Inc, Simi Valley, CA, United States);
Williams, K.(KinetX Aerospace, Inc, Simi Valley, CA, United States);
Page, B.(KinetX Aerospace, Inc, Simi Valley, CA, United States);
Leonard, J. M.(KinetX Aerospace, Inc, Simi Valley, CA, United States)
Abstract: The Origins Spectral Interpretation Resource Identification Security Regolith Explorer (OSIRIS-REx) mission is a NASA New Frontiers mission launching in 2016 to rendezvous with the small, Earth-crossing asteroid (101955) Bennu in late 2018, and ultimately return a sample of regolith to Earth. Approximately 3 months before the encounter with Bennu, the asteroid finally becomes detectable in the narrow field PolyCam imager. The spacecraft's rendezvous with Bennu begins with a series of four Asteroid Approach Maneuvers, which slow the spacecraft's speed relative to Bennu beginning two and a half months prior to closest approach, ultimately delivering the spacecraft to a point 18 km from Bennu on Nov 18, 2018. An extensive campaign of proximity operations activities to characterize the properties of Bennu and select a suitable sample site will follow. This paper will discuss the challenges of navigating near a small 500-m diameter asteroid. The navigation at close proximity is dependent on the accurate mathematical model or digital terrain map of the asteroids shape. Predictions of the spacecraft state are very sensitive to spacecraft small forces, solar radiation pressure, and mis-modeling of Bennu's gravity field. Uncertainties in the physical parameters of the central body Bennu create additional challenges. The navigation errors are discussed and their impact on science planning will be presented.
Publication Date: Feb 09, 2016
Document ID:
20160001714
(Acquired Feb 10, 2016)
Subject Category: ASTRODYNAMICS
Report/Patent Number: AAS 16-101, GSFC-E-DAA-TN29673
Document Type: Oral/Visual Presentation
Publication Information: (SEE 20160001404)
Meeting Information: American Astronautical Society Guidance, Navigation and Control Conference ; 39th; 5-10 Feb. 2016; Breckenridge, CO; United States
Meeting Sponsor: American Astronautical Society; Springfield, VA, United States
Contract/Grant/Task Num: NNG13FC02C
Financial Sponsor: NASA Goddard Space Flight Center; Greenbelt, MD United States
Organization Source: NASA Goddard Space Flight Center; Greenbelt, MD United States
Description: 37p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright; Distribution as joint owner in the copyright
NASA Terms: ASTEROIDS; SAMPLE RETURN MISSIONS; SPACE RENDEZVOUS; SPACECRAFT MANEUVERS; SPACE NAVIGATION; ORBIT DETERMINATION; SOLAR RADIATION; RADIATION PRESSURE; GRAVITATIONAL FIELDS; MATHEMATICAL MODELS; DIGITAL DATA; ERROR ANALYSIS
Other Descriptors: OSIRIS-REX; ORBIT; COVARIANCE
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