JPL Technical Report Server

Dawn's mission at Ceres

Show simple item record Whiffen, Gregory J. Grebow, Daniel J. Smith, John C. 2019-05-30T19:20:55Z 2019-05-30T19:20:55Z 2016-09-12
dc.identifier.citation AIAA/AAS Astrodynamics Specialist Conference, Long Beach, California, September 12-15, 2016 en_US
dc.identifier.clearanceno 16-3736
dc.description.abstract Dawn is NASA's ninth Discovery class mission. The Dawn spacecraft was designed to orbit both the giant asteroid Vesta and the dwarf planet Ceres in succession, a mission only made possible by the high efficiency of ion propulsion. While the same spacecraft visited both bodies, the mission planning and maneuver execution at the two bodies were necessarily very different. The mission at Vesta benefited from at least three functioning reaction control wheels. At Ceres, all maneuvering and coasting during transfers was done without reaction wheel control due to the loss of the second of four wheels while departing Vesta. Loss of the second wheel made conserving attitude control propellant (hydrazine) critical to achieving mission success at Ceres. To save hydrazine, avoiding unnecessary coasting and attitude turns became essential during the interplanetary cruise to Ceres and for all transfers once at Ceres. In contrast, operations at Vesta did not need to avoid coasting. Operating at Ceres requires being farther from the Sun. Greater heliocentric distances (approaching 3 A.U.) make Dawn's attitude control constraints while maneuvering more restrictive as a result of reduced control authority. 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, 2016 en_US
dc.title Dawn's mission at Ceres en_US
dc.type Preprint en_US

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