Engineering topics
Yen, Chen-wan L.
Publications and source records attributed to Yen, Chen-wan L..
EPOXI Trajectory and Maneuver Analyses
The EPOXI mission is a NASA Discovery Mission of Opportunity combining two separate investigations: Extrasolar Planet Observation and Characterization (EPOCh) and Deep Impact eXtended Investigation (DIXI). Both investigations reused the DI instruments and spacecraft that successfully flew by the comet Tempel-1 (4 July 2005). For EPOCh, the goal was to find exoplanets with the high resolution imager, while for DIXI it was to fly by the comet Hartley 2 (4 Nov 2010). This paper documents the navigation experience of the earlier ma-neuver analyses critical for the EPOXI mission including statistical ?V analyses and other useful analyses in designing maneuvers. It also recounts the trajectory design leading up to the final reference trajectory to Hartley 2.
Solar sail geostorm warning mission design
In the solar sail community, a Geostorm warning mission is regarded as one of the best choices for the first application os solar sail technology. In a Geostorm warning mission, a spacecraft is placed between Sun and Earth so that any harmful solar events are detected before Earth experiences them.
Hermes Global Orbiter Mission Design
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Planetary Missions Enabled by Space Nuclear Power
Several interesting planetary missions are either enabled or significantly enhanced by nuclear electric propulsion (NEP) in the 50 to 100kW power range.