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<title>AAS 98-185</title><body BGCOLOR="ffffff"> <h2>AAS 98-185</h2> <h2>AUTONOMOUS CONTROLLED LANDING ON COMETARY BODIES</h2> <h4>S. Dawson, C. W. Potterveld, H. Konigsmann, L. Early - Microcosm Inc.</h4> <h2> Abstract </h2> Control laws for autonomously guiding a spacecraft through a series of waypoints in inertial space were applied to the problem of autonomously landing on a cometary body. The cometary body used was based largely on models of comet 46 P/Wirtanen. Waypoints were generated by solving Lambert's Problem in universal variables. Initial simulations resulted in soft touchdowns (< 1 m/s) within a few meters of the intended target, demonstrating the feasibility of this approach. <P><A HREF="http://www.space-flight.org/AAS_meetings/1998_winter/sessions.html">Back</A>