Orientation and rotational parameters of asteroid 4179 toutatis: New insights from chang'e-2's close flyby

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题名:	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
贡献者:	理學院天文研究所
关键词:	Angular momentum;Asteroids;Astronomy;Chinese spacecraft;Dynamic tests;Dynamics;Fourier analysis;Mathematical models;Orientation;Rotational;Simulation;Star & galaxy formation
日期:	2015-04-24
上传时间:	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
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