Global mapping of asteroids by frozen orbits: The case of 216 kleopatra
Global mapping of asteroids by frozen orbits: The case of 216 kleopatra
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DOI：
10.1016/j.actaastro.2019.05.026
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发表时间：
2019-08
影响因子：
3.5
通讯作者：
C. Circi;A. D’Ambrosio;Hanlun Lei;E. Ortore
中科院分区：
文献类型：
--
作者：
C. Circi;A. D’Ambrosio;Hanlun Lei;E. Ortore
本文利用冻结轨道的地面轨迹特性（常偏心率和平均近心幅角），研究了不规则小行星的全球测图。事实上，当小行星的大小达到数百公里或更大时，适当的地面轨道设计就成为优化覆盖范围并保证定期观察周期的重要因素。为此目的，在观测行星等规则天体的飞行任务中设计地面轨道所使用的方法被推广到小行星等不规则天体的情况。此外，为了处理小行星的不规则形状，用圆柱坐标取代了经典的球坐标（地理经度和纬度），而地面轨道无法到达的区域则使用适当的四面体建模，这对规划覆盖范围很有用。在这方面，对小行星216 Kleopatra的情况进行了调查。
In this paper, the global mapping of an irregular asteroid is studied referring to the ground track properties of a frozen orbit (at constant eccentricity and argument of pericentre on average). In fact, when the size of the asteroid is in the order of hundreds of kilometres or more, an appropriate design of the ground track becomes an important element to optimise the coverage and guarantee regular cycles of observation. To this end, the methodology used to design the ground track in missions for the observation of regular bodies, like planets, is extended to the case of irregular bodies, such as asteroids. Moreover, to manage the irregular shape of the asteroid, the classical spherical coordinates (geographical longitude and latitude) are replaced by cylindrical coordinates, whereas the regions that are not reached by the ground track are modelled by using appropriate tetrahedra, useful to plan the coverage. In this context, the case of asteroid 216 Kleopatra has been investigated.