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|Title: ||Spacecraft thermal and optical modeling impacts on estimation of the GRAIL Lunar Gravity Field|
|Authors: ||Fahnestock, Eugene G.|
Park, Ryan S.
Konopliv, Alex S.
|Keywords: ||Gravity Recovery and Interior Laboratory (GRAIL)|
|Issue Date: ||13-Aug-2012 |
|Publisher: ||Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2012.|
|Citation: ||AIAA/AAS Astrodynamics Specialist Conference, Minneapolis, Minnesota, August 13-16, 2012|
|Abstract: ||We summarize work performed involving thermo-optical modeling of the two Gravity Recovery And Interior Laboratory (GRAIL) spacecraft. We derived several reconciled spacecraft thermo-optical models having varying detail. We used the simplest in calculating SRP acceleration, and used the most detailed to calculate acceleration due to thermal re-radiation. For the latter, we used both the output of pre-launch finite-element-based thermal simulations and downlinked temperature sensor telemetry. The estimation process to recover the lunar gravity field utilizes both a nominal thermal re-radiation accleration history and an apriori error model derived from that plus an off-nominal history, which bounds parameter uncertainties as informed by sensitivity studies.|
|Appears in Collections:||JPL TRS 1992+|
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