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Estimation of Enceladus plume density using Cassini flight data

Show simple item record Wang, Eric K. Lee, Allan Y. 2015-03-24T22:25:42Z 2015-03-24T22:25:42Z 2011-08-08
dc.identifier.citation AIAA GNC/AFM/MST 2011 Conference, Portland, Oregon, August 8-12, 2011 en_US
dc.identifier.clearanceno 11-2664
dc.description.abstract The Cassini spacecraft was launched on October 15, 1997 by a Titan 4B launch vehicle. After an interplanetary cruise of almost seven years, it arrived at Saturn on June 30, 2004. In 2005, Cassini completed three flybys of Enceladus, a small, icy satellite of Saturn. Observations made during these flybys confirmed the existence of water vapor plumes in the south polar region of Enceladus. Five additional low-altitude flybys of Enceladus were successfully executed in 2008-9 to better characterize these watery plumes. During some of these Enceladus flybys, the spacecraft attitude was controlled by a set of three reaction wheels. When the disturbance torque imparted on the spacecraft was predicted to exceed the control authority of the reaction wheels, thrusters were used to control the spacecraft attitude. Using telemetry data of reaction wheel rates or thruster on-times collected from four low-altitude Enceladus flybys (in 2008–10), one can reconstruct the time histories of the Enceladus plume jet density. The 1σ uncertainty of the estimated density is 5.9–6.7% (depending on the density estimation methodology employed). These plume density estimates could be used to confirm measurements made by other onboard science instruments and to support the modeling of Enceladus plume jets. 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, 2011 en_US
dc.title Estimation of Enceladus plume density using Cassini flight data en_US
dc.type Preprint en_US

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