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双小行星系统表面动力学环境分析

王雅平 王悦 吴晓杰 甘庆波 杨志涛 张耀

王雅平,王悦,吴晓杰,等. 双小行星系统表面动力学环境分析[J]. 北京航空航天大学学报,2024,50(3):940-950 doi: 10.13700/j.bh.1001-5965.2022.0286
引用本文: 王雅平,王悦,吴晓杰,等. 双小行星系统表面动力学环境分析[J]. 北京航空航天大学学报,2024,50(3):940-950 doi: 10.13700/j.bh.1001-5965.2022.0286
WANG Y P,WANG Y,WU X J,et al. Surface dynamical environment analysis of a binary asteroid system[J]. Journal of Beijing University of Aeronautics and Astronautics,2024,50(3):940-950 (in Chinese) doi: 10.13700/j.bh.1001-5965.2022.0286
Citation: WANG Y P,WANG Y,WU X J,et al. Surface dynamical environment analysis of a binary asteroid system[J]. Journal of Beijing University of Aeronautics and Astronautics,2024,50(3):940-950 (in Chinese) doi: 10.13700/j.bh.1001-5965.2022.0286

双小行星系统表面动力学环境分析

doi: 10.13700/j.bh.1001-5965.2022.0286
基金项目: 国家自然科学基金(11872007);空间碎片与近地小行星防御科研项目(KJSP2020020205);中央高校基本科研业务费专项资金
详细信息
    通讯作者:

    E-mail:ywang@buaa.edu.cn

  • 中图分类号: V412.4+1

Surface dynamical environment analysis of a binary asteroid system

Funds: National Natural Science Foundation of China (11872007); Space Debris and Near-Earth Asteroid Defense Research Project (KJSP2020020205); The Fundamental Research Funds for the Central Universities
More Information
  • 摘要:

    双小行星系统在太阳系中普遍存在,具有独特的探测价值,揭示其表面动力学环境是实现表面巡游探测的关键。相比于单小行星,双星系统成员间的摄动作用对表面动力学环境存在影响,需要加以专门的分析和研究。以近地双小行星系统(66391) Moshup为例,主、次星均采用多面体引力场模型,通过推导质点在主、次星表面附近的动力学方程,计算出主、次星的表面等效重力和表面坡度,以及表面各点处的最小和最大起飞速度,分析分布规律和成因,特别关注次星对高速旋转主星的周期性潮汐力的影响。在此研究结果的基础上,针对主星和次星分析适合探测器着陆和表面巡游的区域。结果表明:由于旋转离心力的影响,主、次星表面的等效重力分布有随纬度减小而降低的趋势,而坡度主要与局部地形相关,主星的北极高纬度区域和次星南北纬80°以上的区域坡度小,且等效重力较大,适合作为探测器的着陆点或开展表面巡游;次星潮汐力对主星表面重力存在周期性影响;主星表面大部分区域的最小起飞速度小于0.3 m/s,次星表面大部分区域的最小起飞速度在0.10~0.25 m/s之间。由于自转影响,主、次星的最小起飞速度方向几乎全部朝东。

     

  • 图 1  双小行星系统附近的质点

    Figure 1.  A particle near a binary asteroid system

    图 2  顶点的法向量示意图

    Figure 2.  Normal vector diagram of vertex

    图 3  主星表面等效重力

    Figure 3.  Equivalent gravity on primary asteroid surface

    图 4  次星表面等效重力

    Figure 4.  Equivalent gravity on secondary asteroid surface

    图 5  主星表面坡度

    Figure 5.  Slope on primary asteroid surface

    图 6  次星表面坡度

    Figure 6.  Slope on secondary asteroid surface

    图 7  主星等效重力的周期图像

    Figure 7.  Periodic image of equivalent gravity on primary asteroid

    图 8  主星自身引力

    Figure 8.  Gravitational force on primary asteroid

    图 9  主星离心力

    Figure 9.  Centrifugal force on primary asteroid

    图 10  次星对主星的潮汐力

    Figure 10.  Tidal force of secondary against primary asteroid

    图 11  次星对主星潮汐力的周期图像

    Figure 11.  Periodic image of tidal force of the secondary against primary asteroid

    图 12  表面粒子的动力学分析

    Figure 12.  Dynamics analysis of surface particle

    图 13  $\phi = 30^\circ $时主星表面最小起飞速度

    Figure 13.  Minimum lift-off velocity on primary asteroid surface when $\phi = 30^\circ $

    图 14  $\phi = 30^\circ $时主星表面最大起飞速度

    Figure 14.  Maximum lift-off velocity on primary asteroid surface when $\phi = 30^\circ $

    图 15  不可起飞速度为50 m/s时主星表面最大起飞速度

    Figure 15.  Maximum lift-off velocity on primary asteroid surface when upper limit lift-off velocity is 50 m/s

    图 16  $\phi = 30^\circ $时次星表面最小起飞速度

    Figure 16.  Minimum lift-off velocity on secondary asteroid surface when $\phi = 30^\circ $

    图 17  $\phi = 30^\circ $时次星表面最大起飞速度

    Figure 17.  Maximum lift-off velocity on secondary asteroid surface when $\phi = 30^\circ $

    表  1  双小行星系统(66391) Moshup的基本参数

    Table  1.   Basic parameters of the binary asteroid (66391) Moshup

    行星 质量/
    (1012 kg)
    密度/
    (kg·m−3)
    自转周期/h 尺寸/km 双星距离/km
    主星 2.353 1970 2.7645 1.532×1.495×1.347 2.54
    次星 0.135 2810 17.4223 0.571×0.463×0.349 2.54
    下载: 导出CSV
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出版历程
  • 收稿日期:  2022-04-27
  • 录用日期:  2022-06-05
  • 网络出版日期:  2022-06-15
  • 整期出版日期:  2024-03-27

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