1.航天飞行动力学技术重点实验室,北京,100094
2.北京航天飞行控制中心,北京,100094
3.武汉大学数学与统计学院,湖北 武汉,430072
4.北京师范大学天文系,北京,100875
5.北京师范大学天文与天体物理前沿科学研究所,北京,100875
刘山洪,博士,助理研究员,主要从事天体物理场建模与智能计算研究。shanhongliu@whu.edu.cn
黄皓,博士生。202431101069@mail.bnu.edu.cn
收稿:2024-04-09,
纸质出版:2025-07-05
移动端阅览
刘山洪,吴正楷,黄皓,等.基于地基观测数据的2016HO3历表重建与精度分析[J].武汉大学学报(信息科学版),2025,50(7):1304-1310.
LIU Shanhong,WU Zhengkai,HUANG Hao,et al.Reconstruction and Accuracy Analysis of 2016HO3 Ephemeris Based on Ground Observations[J].Geomatics and Information Science of Wuhan University,2025,50(7):1304-1310.
刘山洪,吴正楷,黄皓,等.基于地基观测数据的2016HO3历表重建与精度分析[J].武汉大学学报(信息科学版),2025,50(7):1304-1310. DOI:10.13203/j.whugis20230120
LIU Shanhong,WU Zhengkai,HUANG Hao,et al.Reconstruction and Accuracy Analysis of 2016HO3 Ephemeris Based on Ground Observations[J].Geomatics and Information Science of Wuhan University,2025,50(7):1304-1310. DOI:10.13203/j.whugis20230120
小天体历表是小天体探测任务的重要基础支撑数据,工程和科学上均具有较强的现实意义。针对天问二号任务探测目标之一的近地小行星2016HO3,分析了截至2022年10月可获得的地基天文观测情况,建立起小天体历表解算流程。拟合后结果表明:赤经和赤纬方向上观测量残差基本在1.0″以内,证实了处理流程和解算策略的合理性。重建历表1 a尺度上与喷气推进实验室发布的结果比较,两者差异赤经和赤纬方向上分别小于0.025″和0.25″。不同权重模型以及观测点取舍对定轨精度有较大影响,扣除2004年的两组观测值并叠加使用vfcc17权重模型时解算历表精度最高,在50 a尺度上与喷气推进实验室线上历书系统的位置差异的均方根为87.393 km。
Objectives
2
The ephemeris of small bodies is an important and basic supporting data in small body exploration missions
which has strong practical significance in engineering and science. We aim at the near-Earth asteroid
2016HO3
one of the exploration targets of the Tianwen 2 mission.
Methods
2
First
we introduce and analyze the available ground-based observation data
and establish the process of using ground-based observation data to solve the ephemeris of small celestial body
2016HO3. According to solving epoch
weighting and observation selection
16 orbit determination schemes were compared.
Results
2
The results show that the observed residuals after fitting in the right ascension and declination directions are almost within 1.0″
which confirms the rationality of the data processing flow and the calculation strategy. Compared with the ephemeris published by Jet Propulsion Laboratory(JPL)
during one year the differences between the two are less than 0.025″ and 0.25″ in the right ascension and declination directions respectively. It has been also noticed that different weighting models and the processing of observations significantly affect the orbit determination of 2016HO3.
Conclusions
2
When using observations excluding two observations at 2004 combined with the vfcc17 weight model
the root mean square of position difference with respect to the ephemeris provided by JPL Horizons during 50 a is about 87.393 km. This study can provide some reference and basic data support for the measurement data processing of the upcoming Tianwen 2 mission.
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