| 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
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The binary asteroids are quite common in the solar system and are of unique scientific value. Studying the surface dynamical environment is the key to enabling surface roving exploration. The surface dynamical environment of the primary and secondary asteroid may be significantly affected by disturbances between them as compared to a single asteroid. In this study, the near-Earth binary asteroid system (66391) Moshup is taken as an example for the surface dynamical environment investigation. The polyhedral gravitational field models of the primary and secondary are adopted to establish the dynamical model of a point mass near the asteroid surface. The surface equivalent gravity and slope of the primary and secondary, as well as the minimum and maximum lift-off speeds, are calculated, and their distributions on the surface are analyzed. Much attention is focused on the periodical tidal effect of the secondary on the surface dynamical environment of the primary. Suitable areas on the primary and secondary for landing and roving are analyzed. Results show that the rotational centrifugal force causes the equivalent gravity to tend to decrease with latitude, and the slope is mostly dependent on the local terrain. The regions near the north pole of the primary and above the latitude of 80° of the secondary have small slopes and large equivalent gravity and are suitable for landing or roving. The tidal effect of the secondary has a periodic impact on the surface gravity of the primary. The minimum lift-off speeds in most areas of the primary surface are less than 0.3 m/s, while those in most areas of the secondary surface are between 0.10 m/s to 0.25 m/s. Due to the asteroid's rotation, almost all the directions of the minimum lift-off speeds are eastward.
| [1] |
MARGOT J L, NOLAN M C, BENNER L A M, et al. Binary asteroids in the near-Earth object population[J]. Science, 2002, 296(5572): 1445-1448. doi: 10.1126/science.1072094
|
| [2] |
SHI Y, WANG Y, XU S J. Equilibrium points and associated periodic orbits in the gravity of binary asteroid systems: (66391) 1999 KW4 as an example[J]. Celestial Mechanics and Dynamical Astronomy, 2018, 130(4): 32-36.
|
| [3] |
WERNER R A. The gravitational potential of a homogeneous polyhedron or don’t cut corners[J]. Celestial Mechanics and Dynamical Astronomy, 1994, 59: 253-278.
|
| [4] |
张振江, 崔祜涛, 任高峰. 不规则形状小行星引力环境建模及球谐系数求取方法[J]. 航天器环境工程, 2010, 27(3): 383-388. doi: 10.3969/j.issn.1673-1379.2010.03.024
ZHANG Z J, CUI H T, REN G F. Modeling of gravitational environment of irregular shaped asteroids and methods for obtaining spherical harmonic coefficients[J]. Spacecraft Environment Engineering, 2010, 27(3): 383-388(in Chinese). doi: 10.3969/j.issn.1673-1379.2010.03.024
|
| [5] |
LIANG C H, YUN Z. Methods for computing the gravitational potential of a small solar body[J]. Applied Mechanics and Materials, 2012, 241-244: 2787-2791.
|
| [6] |
SAWAI S, KAWAGUCHI J, OGASAWARA M, et al. Development of a target marker for landing on asteroids[J]. Journal of Spacecraft and Rockets, 2001, 38(4): 601-608. doi: 10.2514/2.3723
|
| [7] |
LIU X D, BAOYIN H X, MA X R. Dynamics of surface motion on a rotating massive homogeneous body[J]. Science China Physics, Mechanics and Astronomy, 2013, 56(4): 818-829. doi: 10.1007/s11433-013-5044-2
|
| [8] |
YU Y, BAOYIN H X. Modeling of migrating grains on asteroid’s surface[J]. Astrophysics and Space Science, 2015, 355(1): 43-56. doi: 10.1007/s10509-014-2140-3
|
| [9] |
JIANG Y, ZHANG Y, BAOYIN H X. Surface motion relative to the irregular celestial bodies[J]. Planetary and Space Science, 2016, 127: 33-43. doi: 10.1016/j.pss.2016.04.007
|
| [10] |
FERRARI F, TANGA P. The role of fragment shapes in the simulations of asteroids as gravitational aggregates[J]. Icarus, 2020, 350: 113871. doi: 10.1016/j.icarus.2020.113871
|
| [11] |
LIU X W, YANG H W, LI S, et al. Lift-off velocity on the surface of a binary asteroid system[J]. Acta Astronautica, 2020, 170: 302-319. doi: 10.1016/j.actaastro.2020.02.006
|
| [12] |
ZHANG Y L, LI J F, ZENG X Y. The dynamical environments analysis of surface particles for different shaped asteroids[J]. Advances in Space Research, 2021, 67(10): 3328-3342. doi: 10.1016/j.asr.2021.02.013
|
| [13] |
WERNER R A, SCHEERES D J. Exterior gravitation of a polyhedron derived and compared with harmonic and mascon gravitation representations of asteroid 4769 Castalia[J]. Celestial Mechanics and Dynamical Astronomy, 1996, 65(3): 313-344.
|
| [14] |
VAN WAL S, SCHEERES D J. The lift-off velocity on the surface of an arbitrary body[J]. Celestial Mechanics and Dynamical Astronomy, 2016, 125(1): 1-31. doi: 10.1007/s10569-016-9671-6
|
| [15] |
WANG Y, WU X J. Analysis of phobos’ dynamical environment considering effects of ephemerides and physical libration[J]. Monthly Notices of the Royal Astronomical Society, 2020, 497(1): 416-434. doi: 10.1093/mnras/staa1948
|
| [16] |
HAMANN B. Curvature approximation for triangulated surfaces[C]//Proceedings of the Geometric Modelling. Berlin: Springer, 1993, 8: 139-153.
|
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