%0 Conference Paper %B 75th Annual Conference, Denver, Colorado %D 2016 %T 3670. Soil Moisture Active Passive Mission Mass Properties Optimization and Analysis %A Hendry IV, Morgan %A Slimko, Erich %K 18. Weight Engineering - Spacecraft Design %K 34. Advanced Design %X The Soil Moisture Active Passive (SMAP) mission creates global soil moisture measurements every 2-3 days by spinning a lightweight, ~6 meter diameter deployable mesh reflector. This represents the largest spinning antenna ever to be used on a NASA satellite. The paper discusses the mass properties challenges that were overcome in implementing the mission, including the definition of a combined imbalance term called the Effective Product of Inertia, the selection of an optimum Spun Instrument focal length and edge offset that fostered a reduced mass properties sensitivity, the inclusion of late game Spun Instrument configuration flexibility, the use of balance mass locations that leveraged the large moment arm provided by the reflector, and a subassembly measurement campaign that reduced mass properties uncertainties on testable components. %B 75th Annual Conference, Denver, Colorado %I Society of Allied Weight Engineers, Inc. %C Denver, Colorado %P 22 %8 05/2016 %U https://www.sawe.org/papers/3670/buy %1 Non-Member Price: $20.00; Member Price: $10.00 Members: First 10 product downloads are Free. %2 10.00 %3 20 %4 SAWE3670