The Institute of Space and Astronautical Science (ISAS) is currently planning an asteroid sample return mission, MUSES-C. The mission plan calls for the spacecraft to approach the asteroid and touch down on its surface to collect samples that will be returned to Earth. During the touch down and sampling phase, the spacecraft will navigate using a target marker placed on the asteroid surface prior to the final approach. By using the target marker as a reference point, navigation during the landing phase will be much more reliable and precise. Because of the micro gravity environment on the asteroid surface the settling time and dynamics of the target marker is a parameter of interest. Thus, it is important to design the target marker with as small a coefficient of restitution as possible. To achieve this small coefficient of restitution the target marker will be constructed out of a bag with balls stored internally. Upon impact, the balls will dissipate energy relative to each other and hence will dissipate the total energy of the target marker. This mechanism has been designed and tested at the Japan Micro gravity Center (JAMIC). In order to better predict the performance of such a target marker, several numerical integrations have been performed which model the motion of a bouncing target marker across the surface of a "real" asteroid shape.
|ジャーナル||Advances in the Astronautical Sciences|
|出版ステータス||Published - 2000|
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