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Odyssey Mars Orbiter - Thirteen Years of On-Orbit NavigationThe Odyssey spacecraft has been in Mars orbit since October 24, 2001 and has nearly completed 61,490 orbits. Navigation operational objectives include the following: Control the local mean solar time for science observations; for most of the mission, this varied from 3:45 pm to 5:20 pm. Currently, an orbit trim maneuver planned for November 10, 2015 will place Odyssey at 6:45 pm/6:45 am at equator crossings in order to observe early morning ground frost, fog and clouds. Initially, Odyssey was late by 42 minutes for an over-flight of the critical seven minutes of Phoenix's entry, descent and landing (EDL). Odyssey was successfully positioned for this over-flight using the Delta V from angular momentum desaturations (AMD). Similar results for the Mars Science Laboratory's EDL and Comet Siding Spring's minimum risk location will be presented. Odyssey has and continues to relay significant quantities of rover data. Navigation successfully models frequent AMD Delta Vs in order to generate accurate sixty-day trajectory predictions; a typical timing error is 25 seconds after 60 days. However, unexpected events, such as safe-mode entries with their larger and more frequent thrusting, severely impact that trajectory accuracy. Impacted trajectories can have timing errors ranging from a few minutes to ten-to-fifteen minutes after sixty-days. Other analyses (briefly stated) include: a) the offset of the orbital ground track pattern after an initial cycle of 30 days or 362 orbits and b) an operations environment of continuous thrusting if/when one of the three remaining reaction wheels fails.
Document ID
20170007051
Acquisition Source
Jet Propulsion Laboratory
Document Type
Conference Paper
External Source(s)
Authors
Esposito, Pasquale
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Jefferson, David C.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Lee, Julim
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
August 1, 2017
Publication Date
October 19, 2015
Subject Category
Space Communications, Spacecraft Communications, Command And Tracking
Lunar And Planetary Science And Exploration
Meeting Information
Meeting: International Symposium on Space Flight Dynamics (ISSFD) 2015
Location: Munich
Country: Germany
Start Date: October 19, 2015
End Date: October 23, 2015
Sponsors: Deutsche Forschungsanstalt fuer Luft- und Raumfahrt, European Space Agency. European Space Operations Center
Distribution Limits
Public
Copyright
Other
Keywords
trajectory accuracy
Comet Siding Spring
MSL
Phoenix
angular momentum desaturation

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