1. 中国科学院紫金山天文台 南京 210023;2. 中国科学院空间目标与碎片观测重点实验室 南京 210023
1. Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210023;2. Key Laboratory of Space Object and Debris Observation, Chinese Academy of Sciences, Nanjing 210023;
2022年1月, 失效的北斗G2卫星被实践21号卫星从地球静止轨道拖入了坟墓轨道. 为了这项捕获任务的安全实施, 需要预先确定北斗G2的旋转状态. 基于过去10 yr的测光观测数据展示了北斗G2卫星自转的演化过程. 根据北斗G2的自转速度和轨道的演化, 确认了在过去的10 yr里发生的6次异常事件. 据推测, 2012年的小碎片碰撞事件, 是随后几年燃油泄漏的导火索. 2017年之后剩余燃油完全释放, 再也没有出现转速异常. 将2014年太阳能帆板损坏和2016年的解体事件后建立的旋转动力学模型外推1 yr, 转轴的标准偏差小于3°, 转速标准偏差为0.11°· s-1, 能够有效地满足捕获任务时刻旋转状态的精度要求.
In January 2022, the defunct satellite BeiDou-G2 was pulled out of geostationary orbit by Shijian-21 to a graveyard orbit. For safe docking and operation, it was necessary to determine the rotation state in advance. In this paper, we show the evolution of the rotation of the BeiDou-G2 satellite based on the photometry observation data for the past 10 years. The rotational speed of BeiDou-G2 was found to be annual oscillation, mainly due to the solar radiation. Based on the evolution of BeiDou-G2's rotation speed and its orbit, we confirmed that in the last 10 years, the satellite had six abnormal events. These abnormal events were mainly due to the increase in the rotation speed caused by suspected fuel leakages. Additionally, the abnormal events included one collision in 2012, which was inferred to be the trigger of the fuel leakages in the following years. No rotational speed abnormalities occurred again after 2017, probably due to the complete release of the residual fuel. The parameters and the propagating models after one incidence of solar panel damage in 2014 and one fragment in 2016, with the standard errors for propagating over 1 year of the rotational axis less than 3° and rotational speed being 0.11°· s-1,were believed to be able to satisfy the accuracy requirements of the rotation state well at the moment of docking.
林厚源.关于北斗G2卫星的溯往追终[J].天文学报,2023,(1):1. LIN Hou-yuan. BeiDou-G2: Past and Present[J]. Acta Astronomica Sinica,2023,(1):1.复制