Geocentric position preliminary detection from the extreme ultraviolet images of Chang'E-3

	Geocentric position preliminary detection from the extreme ultraviolet images of Chang'E-3
	Zheng, Chen1,2 ; Ping, Jinsong2 ; Wang, Mingyuan2 ; Li, Wenxiao2
刊名	ASTROPHYSICS AND SPACE SCIENCE
	2015-08-01
卷号	358 期号:2
关键词	EUVC image Chang'E 3 Geocentric position Detection
英文摘要	An Extreme ultraviolet (EUV) Camera was installed onboard the Chinese lunar surface landing mission, the Chang'E-3 lander, as a useful method to observe the Earth plasmasphere. This EUV optical payload obtained more than 600 moon-based Earth plasmasphere images since December 14, 2013. However, due to errors of unknown size and origin in the platform attitude control of the lander and in the EUV telescope pointing control during the mission operating periods, the geocentric coordinates in these EUV images are not fixed in the same position of CCD pixel. Before adequately calibrating, these positioning offsets will introduce extra errors into the analysis of the plasmaspheric structure. With only a little insufficient telemetry information, an effective calibrating method of circle-based differential algorithm is suggested and demonstrated, for automatically and precisely detecting the geocentric position in each EUV image of Chang'E-3 mission. In each EUV image, the tested method uses the outline of a circle as the basic unit to capture the contour for the bright region based on the spectral characteristic. Then, the center of the extracted circle is adopted as the geocentric position for the image. The preliminary analysis shows that this method can effectively detect the geocentric position being always consistent with the recognition result by the basic hand labor method. It is found that the radius of the circles varies from month to month from December, 2013 to May, 2014. The monthly averages of radius show relative notable positive correlation and negative correlation with the changes of both Zenith angle of the Earth at the landing area of Chang'E-3 lander, and the Earth-moon distance, respectively. This method and results here will benefit the Chang'E-3 EUV study.
收录类别	SCI
语种	英语
WOS记录号	WOS:000359016500005
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/5646]
专题	国家天文台_月球与深空探测研究部
作者单位	1.Henan Univ, Sch Math & Stat, Kaifeng 475000, Peoples R China 2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
推荐引用方式 GB/T 7714	Zheng, Chen,Ping, Jinsong,Wang, Mingyuan,et al. Geocentric position preliminary detection from the extreme ultraviolet images of Chang'E-3[J]. ASTROPHYSICS AND SPACE SCIENCE,2015,358(2).
APA	Zheng, Chen,Ping, Jinsong,Wang, Mingyuan,&Li, Wenxiao.(2015).Geocentric position preliminary detection from the extreme ultraviolet images of Chang'E-3.ASTROPHYSICS AND SPACE SCIENCE,358(2).
MLA	Zheng, Chen,et al."Geocentric position preliminary detection from the extreme ultraviolet images of Chang'E-3".ASTROPHYSICS AND SPACE SCIENCE 358.2(2015).