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| 題名: | Orientation and rotational parameters of asteroid 4179 toutatis: New insights from chang'e-2's close flyby |
| 作者: | 葉永烜;Zhao, Yuhui;Ji, Jianghui;Huang, Jiangchuan;Hu, Shoucun;Hou, Xiyun;Li, Yuan;Ip, Wing-Huen |
| 貢獻者: | 理學院天文研究所 |
| 關鍵詞: | Angular momentum;Asteroids;Astronomy;Chinese spacecraft;Dynamic tests;Dynamics;Fourier analysis;Mathematical models;Orientation;Rotational;Simulation;Star & galaxy formation |
| 日期: | 2015-04-24 |
| 上傳時間: | 2026-04-21 14:34:57 (UTC+8) |
| 出版者: | Oxford University Press;London: Oxford University Press |
| 摘要: | 摘要： In this paper, we investigate the rotational dynamics of the ginger-shaped near-Earth asteroid 4179 Toutatis, which was closely observed by Chang'e-2 at a distance of 770 plus or minus 120 m from the asteroid's surface during the outbound flyby on 2012 December 13. A sequence of high-resolution images was acquired during the flyby mission. In combination with ground-based radar observations collected over the last two decades, we analyse these flyby images and determine the orientation of the asteroid at the flyby epoch. The 3-1-3 Euler angles of the conversion matrix from the J2000 ecliptic coordinate system to the body-fixed frame are evaluated to be -20 ...1 plus or minus 1..., 27 ...6 plus or minus 1... and 42 ...2 plus or minus 1..., respectively. The least-squares method is utilized to determine the rotational parameters and spin state of Toutatis. The characteristics of the spin-state parameters and angular momentum variations are extensively studied using numerical simulations, which confirm those reported by Takahashi, Busch & Scheeres (2013, AJ, 146, 95). The large amplitude of the precession of Toutatis is assumed to be responsible for its tumbling attitude as observed from Earth. The angular momentum orientation of Toutatis is determined to be described by ... and beta ...=...10, implying that it has remained nearly unchanged for two decades. Furthermore, using Fourier analysis to explore the change in the orientation of the axes of Toutatis, we reveal that the two rotational periods are 5.38 and 7.40 d, respectively, consistent with the results of the earlier investigation. Hence, our investigation provides a clear understanding of the state of the rotational dynamics of Toutatis. (ProQuest: ... denotes formulae/symbols omitted.)
出版者： London: Oxford University Press
出版日期： 2015-07-11
出處： Monthly notices of the Royal Astronomical Society, 2015-07, Vol.450 (4), p.3620-3620
資源來源： Alma/SFX Local Collection
版權： Copyright Oxford University Press, UK Jul 11, 2015
識別號： ISSN: 0035-8711
識別號： EISSN: 1365-2966
識別號： DOI: 10.1093/mnras/stv792 |
| 顯示於類別: | [天文研究所] 期刊論文
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