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Coupling of system resource margins through the use of electric propulsion: Implications in preparing for the Dawn mission to Ceres and Vesta
Affiliation:1. Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Dr., Pasadena, CA 91109, USA;2. University of California, Los Angeles, Institute of Geophysics and Planetary Physics, Los Angeles, CA 90095, USA;1. Academy of Opto-Electronics, University of Chinese Academy of Sciences, 100094 Beijing, People''s Republic of China;2. Academy of Opto-Electronics, 100094 Beijing, People''s Republic of China;3. Key Laboratory of Space Utilization, Technology and Engineering Center for Space Utilization, 100094 Beijing, People''s Republic of China;1. School of Aerospace, Tsinghua University, Beijing 100084, China;2. Science and Technology on Aerospace Flight Dynamics Laboratory, Beijing 100094, China;3. Beijing Aerospace Control Center, Beijing 100094, China;1. University of Michigan, Ann Arbor, MI 48109-2102, USA;2. Michigan Technological University, Houghton, MI 49931-1295, USA;1. Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA;2. Massachusetts Institute of Technology, Cambridge, MA 02139-4307, USA;3. Planetary Science Institute, Tucson, AZ 85719, USA;4. Universit́e Pierre et Marie Curie, UPMC 06, Paris, France;5. IMCCE, Observatoire de Paris, CNRS UMR 8028, 77 Avenue Denfert-Rochereau, 75014 Paris, France;6. Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, USA;7. Solar System Exploration Division, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
Abstract:The Dawn project is progressing toward its 2007 launch on a mission to orbit main belt asteroids (1) Ceres and (4) Vesta. Designed to provide insights into important questions about the evolution of the solar system, Dawn will spend more than 0.5 years in orbit about each of these bodies. This challenging mission is enabled by an ion propulsion system. In contrast to missions that use conventional chemical propulsion, the use of this system creates a strong coupling of allowable flight system mass and available power, thereby requiring different methods of managing these and other technical resources. Now that the project is nearing launch, the refinement of resource estimates allows the identification of excess margin, which is being applied in novel ways to benefit the project both in development and in operations.
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