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Revisit of rotational dynamics of Asteroid 4179 Toutatis from Chang'e-2's flyby

Published online by Cambridge University Press:  01 March 2016

Yuhui Zhao ,
Shoucun Hu  and
Jianghui Ji
Yuhui Zhao
Affiliation:
Laboratory of Planetary Sciences, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, China email: [email protected], [email protected]
Shoucun Hu
Affiliation:
Laboratory of Planetary Sciences, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, China email: [email protected], [email protected]
Jianghui Ji
Affiliation:
Laboratory of Planetary Sciences, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, China email: [email protected], [email protected]
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Abstract

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This paper presents analysis of the rotational parameters of Toutatis based on the observational results from Chang'e-2's close flyby. The 3-D shape model derived from ground-based radar observation is used to calculate the 3-1-3 Euler angles at the flyby epoch, which are evaluated to be −20.1° ± 1°, 27.6° ± 1° and 42.2° ± 1°. The large amplitude of Toutatis' tumbling attitude is demonstrated to be the result of the large deviation of the angular momentum axis and the rotational axis. Two rotational periods are evaluated to be 5.38±0.03 days for rotation about the long axis and 7.40±0.03 days for precession of the long axis about the angular momentum vector based on Fourier analysis. These results provide a further understanding of rotational state of Toutatis.

Keywords

minor planetsasteroids
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Issue S318: Asteroids: New Observations, New Models , August 2015 , pp. 156 - 159
Copyright
Copyright © International Astronomical Union 2016 

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