天问二号星载光学观测小行星(469219)Kamo`oalewa轨道精度仿真分析  

Orbit Accuracy Simulation Analysis of Asteroid(469219) Kamo`oalewa by Optical Observation of Tianwen-2

作　　者：厉奕行 唐凯[1] 樊敏[3] 曲耀斌[4] 黄勇[1,2] LI Yi-xing;TANG Kai;FAN Min;QU Yao-bin;HUANG Yong(Shanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai 200030;School of Astronomy and Space Science,University of Chinese Academy of Sciences,Beijing 100049;Beijing Institute of Tracking and Telecommunication Technology,Beijing 100094;Shanghai Institute of Satellite Engineering,Shanghai 201100)

机构地区：[1]中国科学院上海天文台,上海200030 [2]中国科学院大学天文与空间科学学院,北京100049 [3]北京跟踪与通信技术研究所,北京100094 [4]上海卫星工程研究所,上海201100

出　　处：《天文学报》2024年第6期15-25,共11页Acta Astronomica Sinica

基　　金：科工局民用航天技术预先研究项目(D010105)。

摘　　要：中国小行星探测任务—天问二号将于2025年发射升空,其探访的第一个目标,小行星(469219)Kamo`oalewa(又称2016 HO3),是一颗与地球共轨的近地小天体,有着极高的运动演化研究价值.目前小行星(469219)Kamo`oalewa只有有限的地基观测资料,限制了其轨道精度.搭载光学载荷的天问二号在抵近Kamo`oalewa的过程中,预计将获得大量的星载光学观测数据.这将大大改善小行星(469219)Kamo`oalewa只有地基光学观测数据,无2021年后的公开观测资料的状况.通过仿真带有一定轨道误差的天问二号的光学观测数据,完成对小行星(469219)Kamo`oalewa定轨预报精度的任务前评估.精度评估使用协方差分析法和数值比较法,在考虑的可能观测精度范围内,预估天问二号光学观测数据能使小行星(469219)Kamo`oalewa定轨精度整体提升至15 km以内,并且分析了两种精度评估方法结果的差异与特性.China’s asteroid exploration mission,Tianwen-2,is scheduled to launch in 2025.Itsfirst target,asteroid(469219)Kamo`oalewa(also known as 2016 HO3),is a near-Earth object in co-orbit with Earth,with significant research value in terms of its motion evolution.Currently,there are limited ground observation data available for asteroid(469219)Kamo`oalewa,which restricts its orbit accuracy.Tianwen-2,equipped with an optical payload,is expected to acquire a large amount of onboard optical observation data during its approach to Kamo`oalewa.This will greatly improve the study situation of asteroid(469219)Kamo`oalewa,which currently has only ground-based optical observation data and lacks publicly available observation data after 2021.By simulating the optical observation data of Tianwen-2 with a spacecraft orbit error of 2 km,the pre-mission evaluation of the orbit prediction accuracy of asteroid(469219)Kamo`oalewa has been completed.The precision evaluation was performed using covariance analysis and numerical comparison methods.Within the possible range of observation precision considered in this study,it is estimated that the optical observation data from Tianwen-2 can improve the overall orbit accuracy of asteroid(469219)Kamo`oalewa to better than 15 km.Additionally,an analysis was conducted to examine the differences and characteristics of the results obtained from the two precision evaluation methods.

关 键 词：天体测量学 天体力学 方法:数值 小行星:个别:(469219)Kamo`oalewa 

分 类 号：P135[天文地球—天体力学]