NEW INSIGHTS OF ASTEROID 4179 TOUTATIS USING CHINA CHANG&apos;E-2 CLOSE FLYBY   OPTICAL MEASUREMENTS

doi:10.1088/0004-6256/149/1/21

CORC > 北京大学 > 地球与空间科学学院

	NEW INSIGHTS OF ASTEROID 4179 TOUTATIS USING CHINA CHANG'E-2 CLOSE FLYBY OPTICAL MEASUREMENTS
	Bu, Yanlong ; Tang, Geshi ; Di, KaiChang ; Fa, Wenzhe ; Hu, Tianjiang ; Ding, Chibiao ; Xu, Bin ; Liu, Bin ; Cao, Jianfeng ; Hu, Songjie ; Yang, Cheng ; Liu, Chuankai
刊名	astronomical journal
	2015
关键词	minor planets, asteroids: individual (Toutatis) planets and satellites: fundamental parameters planets and satellites: surfaces COMPLEX ROTATION SPIN-STATE 4179-TOUTATIS LIGHTCURVE
DOI	10.1088/0004-6256/149/1/21
英文摘要	The mysteries of near-Earth asteroid 4179 Toutatis have been more comprehensively unveiled by analyzing the optical images taken during the Chang'e-2 flyby in 2012. Compared with previous works, this paper concentrates on the photogrammetric relation between the Chang'e-2 spacecraft and Toutatis and the imaging shadow effect during the flyby. Accurate models of imaging and optical measurements are developed to study Toutatis's dimensions and rotational state at the time of imaging. As the illumination study shows, the shadowed region perpendicular to the long axis accounts for 27.78% of the Toutatis images, while the long axis of the body is fully captured. With a compensation on the shadow effect, the optical measurements reveal that Toutatis's long axis is 4354 +/- 56 m, the maximum length is 4391 +/- 56 m, and the spatial orientation described with the angles of direction cosine during the flyby is (126 degrees.13 +/- 0 degrees.29, 122 degrees.98 +/- 0 degrees.21, 126 degrees.63 +/- 0 degrees.46). Furthermore, a new triaxial ellipsoid of 4354 x 1835 x 2216m and a volume of 7.5158 km(3) are proposed based on the previous Toutatis shape model. The effectiveness of the proposed method is validated, since typical features such as the neck and endpoints agree well with the results simultaneously observed by the ground radar. Moreover, it also potentially provides a feasible approach to precisely calculate the spin period of Toutatis.; Astronomy & Astrophysics; SCI(E); 0; ARTICLE; buyanlong@yahoo.com; tanggeshi@bacc.org.cn; 1; 149
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/206665]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Bu, Yanlong,Tang, Geshi,Di, KaiChang,et al. NEW INSIGHTS OF ASTEROID 4179 TOUTATIS USING CHINA CHANG'E-2 CLOSE FLYBY OPTICAL MEASUREMENTS[J]. astronomical journal,2015.
APA	Bu, Yanlong.,Tang, Geshi.,Di, KaiChang.,Fa, Wenzhe.,Hu, Tianjiang.,...&Liu, Chuankai.(2015).NEW INSIGHTS OF ASTEROID 4179 TOUTATIS USING CHINA CHANG'E-2 CLOSE FLYBY OPTICAL MEASUREMENTS.astronomical journal.
MLA	Bu, Yanlong,et al."NEW INSIGHTS OF ASTEROID 4179 TOUTATIS USING CHINA CHANG'E-2 CLOSE FLYBY OPTICAL MEASUREMENTS".astronomical journal (2015).