Evaluation of the Dynamic Environment of an Asteroid: Applications to 433 Eros
Evaluation of the Dynamic Environment of an Asteroid: Applications to 433 Eros
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DOI：
10.2514/2.4552
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发表时间：
2000-05
影响因子：
2.6
通讯作者：
D. Scheeres;B. Williams;J. Miller
中科院分区：
文献类型：
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作者：
D. Scheeres;B. Williams;J. Miller
介绍了快速、系统地评价小行星附近动力环境的分析方法，重点是小行星的重力场和旋转状态对航天器轨道的影响。这样的分析对于小行星和彗星等小型太阳系天体的飞行任务是有用的，也是必要的，因为在这些天体上，真正的质量、重力场和旋转状态直到航天器与天体会合并估计这些量之后才能知道。一般来说，在估算出这些数量之后，必须根据在小行星上发现的实际值重新设计完整的使命计划。这种重新设计的一个组成部分是描述靠近小行星的动力学特性，特别是计算靠近天体的轨道稳定性，以及在经历大的扰动之前航天器能够接近天体的实际限制。利用近地小行星探测（NEAR）使命任务1998年12月飞越爱神星期间获得的小行星初步模型，对小行星433 Eros进行了数值计算。
Methods of analysis to quickly and systematically evaluate the dynamical environment close to an asteroid are presented, concentrating on the effect of the asteroid’s gravity eld and rotation state on a spacecraft orbit. Such an analysis is useful and needed for missions to small solar system bodies such as asteroids and comets, where the true mass, gravity eld, and rotation state will not be known until after the spacecraft rendezvous with the body and these quantities are estimated. Generally, after these quantities have been estimated, the complete mission pro le must be redesigned in accordance with the actual values found at the asteroid. An integral part of this redesign is the characterization of dynamics close to the asteroid, speci cally the computation of orbit stability close to the body and the practical limits on how close the spacecraft can y to the body before large perturbations are experienced. Numerical computationsof such an evaluationapplied to the asteroid 433 Eros, the target of the Near Earth Asteroid Rendezvous (NEAR) mission, using preliminary models of the asteroid obtained during NEAR’s December 1998 yby of Eros are presented.