Tiangong-1 ' s accelerated self-spin before reentry

doi:10.1186/s40623-019-0996-8

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	Tiangong-1 ' s accelerated self-spin before reentry
	Lin, Hou-Yuan 1,6; Zhu, Ting-Lei 1,6; Liang, Zhi-Peng 2,6; Zhao, Chang-Yin 1,6; Wei, Dong 1,6; Zhang, Wei 1,6; Han, Xing-Wei 2,6; Zhang, Hai-Feng 3,6; Wei, Zhi-Bin 4; Li, Yu-Qiang 5,6
刊名	EARTH PLANETS AND SPACE
	2019-02-12
卷号	71 页码:9
关键词	Tiangong-1 Rotational state estimation Space debris SLR
ISSN号	1880-5981
DOI	10.1186/s40623-019-0996-8
英文摘要	The detection and study of the rotational motion of space debris, which is affected by environmental factors, is a popular topic. However, relevant research in extremely low-orbit regions cannot be conducted due to a lack of observational data. Here, we fill in the gaps to present the rotational evolution of Tiangong-1 in the 5months prior to reentry. Derived from the changes in the relative distance of its two corner cube reflectors from satellite laser ranging data, the angular momentum of Tiangong-1, which is relatively stable during observation, deviates from its maximum principal axis of inertia and precesses around the normal direction of the orbital plane due to gravity gradient torque at an angle of 23.1 degrees +/- 2.5 degrees. Requiring consistency with the relationship between the angular momentum and precession rate leads to a solution for the rotation rate, which is thus found to increase. This result cannot be explained by any previously developed torque models. Hence, an atmospheric density gradient torque (ADGT) model that considers the torque generated by the change in atmospheric density with orbital altitude at the satellite scale is proposed to explain the rotational acceleration mechanism of extremely low-orbit objects. The numerical results show that the ADGT model provides a non-negligible ability to explain, but cannot fully describe, the acceleration effect. The data on the rotational evolution of Tiangong-1 can provide an important basis for aerodynamic model improvement by addressing minor factors omitted in previous models.
资助项目	National Natural Science Foundation of China[11533010] ; National Natural Science Foundation of China[11703095] ; Youth Innovation Promotion Association, CAS[2018353] ; Chinese Academy of Sciences Foundation[KGFZD-135-16-012]
WOS研究方向	Geology
语种	英语
出版者	SPRINGEROPEN
WOS记录号	WOS:000458751900001
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/31925]
专题	中国科学院上海天文台
通讯作者	Zhao, Chang-Yin
作者单位	1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210034, Jiangsu, Peoples R China 2.Chinese Acad Sci, Natl Astron Observ, Changchun Observ, Changchun 130117, Jilin, Peoples R China 3.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 4.Chinese Acad Surveying & Mapping, Beijing 100830, Peoples R China 5.Chinese Acad Sci, Yunnan Observ, Kunming 650216, Yunnan, Peoples R China 6.Chinese Acad Sci, Key Lab Space Object & Debris Observat, Nanjing 210034, Jiangsu, Peoples R China
推荐引用方式 GB/T 7714	Lin, Hou-Yuan,Zhu, Ting-Lei,Liang, Zhi-Peng,et al. Tiangong-1 ' s accelerated self-spin before reentry[J]. EARTH PLANETS AND SPACE,2019,71:9.
APA	Lin, Hou-Yuan.,Zhu, Ting-Lei.,Liang, Zhi-Peng.,Zhao, Chang-Yin.,Wei, Dong.,...&Deng, Hua-Rong.(2019).Tiangong-1 ' s accelerated self-spin before reentry.EARTH PLANETS AND SPACE,71,9.
MLA	Lin, Hou-Yuan,et al."Tiangong-1 ' s accelerated self-spin before reentry".EARTH PLANETS AND SPACE 71(2019):9.