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|Title: ||Attitude Determination and Control Subsystem (ADCS) preperations for the EPOXI flyby of Comet Haley 2|
|Authors: ||Luna, Michael E.|
Collins, Stephen M.
|Issue Date: ||8-Aug-2011 |
|Publisher: ||Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2011.|
|Citation: ||AIAA Guidance, Navigation, and Control Conference, Portland, Oregon, August 8, 2011|
|Abstract: ||On November 4, 2010 the already “in-flight” Deep Impact spacecraft flew within 700km of comet 103P/Hartley 2 as part of its extended mission EPOXI, the 5th time to date any spacecraft visited a comet. In 2005, the spacecraft had previously imaged a probe impact comet Tempel 1. The EPOXI flyby marked the first time in history that two comets were explored with the same instruments on a re-used spacecraft—with hardware and software originally designed and optimized for a different mission. This made the function of the attitude determination and control subsystem (ADCS) critical to the successful execution of the EPOXI flyby. As part of the spacecraft team preparations, the ADCS team had to perform thorough sequence reviews, key spacecraft activities and onboard calibrations. These activities included: review of background sequences for the initial conditions vector, sun sensor coefficients, and reaction wheel assembly (RWA) de-saturations; design and execution of 10 trajectory correction maneuvers; science calibration of the two telescope instruments; a flight demonstration of the fastest turns conducted by the spacecraft between Earth and comet point; and assessment of RWA health (given RWA problems on other spacecraft).|
|Appears in Collections:||JPL TRS 1992+|
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