Re-reduction of CCD observations of Triton in 1996-2006 with Gaia DR2 and comparison with ephemerides

doi:10.1016/j.icarus.2020.113662

CORC > 国家授时中心 > 中国科学院国家授时中心 > 高精度时间传递与精密测定轨研究室

	Re-reduction of CCD observations of Triton in 1996-2006 with Gaia DR2 and comparison with ephemerides
	Yan, D.4; Qiao, R. C.3; Cheng, X.3; Yu, Y.1,2
刊名	ICARUS
	2020-06-01
卷号	343 页码:6
关键词	Astrometry Satellites, general Neptune, satellites
ISSN号	0019-1035
DOI	10.1016/j.icarus.2020.113662
英文摘要	The release of new high-precision and high-density catalogue Gaia DR2 brings new opportunities and challenges to high-precision astrometry. The early CCD images of planet satellites can be re-processed so as to give positions that are much more accurate than those initially obtained. Based on Gaia DR2 catalogue, the early CCD images of Triton taken by Qiao et al. in 1996-2006 were re-reduced. A total of 1007 positions of Triton were derived from the new measurement and reduction, including 66 new observed positions and 941 updated observed positions. The comparison between these re-reduction positions and the theoretical positions, which derived from satellite model of Emelyanov et al. (2015) and planetary ephemeris DE431, shows that the mean residuals (O-C) are 19 mas in right ascension and 25 mas in declination, the standard deviation of residuals (O-C) are 44 mas and 33 mas in right ascension and declination, respectively. Benefiting from Gaia DR2, this astrometric precision is better than that of the original positions. Moreover, we also compared two catalogues of UCAC2 and Gaia DR2, three recent orbit models of Triton as well as seven different planetary ephemerides of Neptune. These comparisons show that the differences among all the three orbit models of Triton are very small within 3 mas. However, there are significant differences between different catalogues (Gaia DR2 and UCC2) and among different planetary ephemerides. These two differences are the main reasons for the presence of some systematic errors of the original observation positions published in Qiao et al. (2007).
资助项目	National Natural Science Foundation of China[11703007] ; National Natural Science Foundation of China[11573029]
WOS关键词	ASTROMETRIC OBSERVATIONS ; NEPTUNIAN SATELLITES ; POLE
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	ACADEMIC PRESS INC ELSEVIER SCIENCE
WOS记录号	WOS:000527007000004
资助机构	National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://210.72.145.45/handle/361003/9371]
专题	国家授时中心_高精度时间传递与精密测定轨研究室
通讯作者	Yan, D.
作者单位	1.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 3.Chinese Acad Sci, Natl Time Serv Ctr, Lintong 710600, Shaanxi, Peoples R China 4.Huanggang Normal Univ, Sch Phys & Elect Informat, Huanggang 438000, Peoples R China
推荐引用方式 GB/T 7714	Yan, D.,Qiao, R. C.,Cheng, X.,et al. Re-reduction of CCD observations of Triton in 1996-2006 with Gaia DR2 and comparison with ephemerides[J]. ICARUS,2020,343:6.
APA	Yan, D.,Qiao, R. C.,Cheng, X.,&Yu, Y..(2020).Re-reduction of CCD observations of Triton in 1996-2006 with Gaia DR2 and comparison with ephemerides.ICARUS,343,6.
MLA	Yan, D.,et al."Re-reduction of CCD observations of Triton in 1996-2006 with Gaia DR2 and comparison with ephemerides".ICARUS 343(2020):6.