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geophysical and orbital environments of asteroid 4692192016 HO3

Astrodynamics 2023年第1期7卷 31-50页

作者： Xiangyu Li Daniel J.Scheeres Dong Qiao Zixuan Liu School of Aerospace Engineering Beijing Institute of TechnologyBeijing 100081China Ann and H.J.Smead Aerospace Engineering Department University of Colorado Boulder429 UCBBoulderCO 80309USA

Asteroid 469219 Kamo'oalewa,also named 2016 HO3,is a small-size fast-rotating near-Earth asteroid,which is a potential target for future explorations.Owing to its weak gravity and fast spin rate,the dynamics on the surface or in the vicinity of 2016 HO3 are significantly different from those of planets or other small bodies explored in previous missions.In this study,the geophysical and orbital environments of 2016 HO3 were investigated to facilitate a potential mission design.First,the geormnetric and geopotential topographies of 2016 HO3 were examined using difterent shape models.The liftoff and escape conditions on its fast-rotating surface were investigated.Then,the periodic orbits around 2016 HO3 were studied in the asteroid-fixed frame and the Sun-asteroid frame considering the solar radiation pressure.The stable regions of the terminator orbits were discussed using different parameters.Finally,the influence of the nonspherical shape on the terminator orbits was examined.The precise terminator orbits around a real shape model of 2016 HO3 were obtained and verified in the high-fidelity model.This study shows that the polar region of 2016 HO3 is the primary region for landing or sampling,and the terminator orbits are well suited for global mapping and measurements of 2016 HO3.The analysis and methods can also serve as references for the exploration of other small fast-rotating bodies.

关键词： asteroid 2016 HO3 geophysical environment solar radiation pressure terminator orbit

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