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

doi:10.1016/j.icarus.2020.113662

	Re-reduction of CCD observations of Triton in 1996-2006 with Gaia DR2 and comparison with ephemerides
	Yan, D.1; Qiao, R. C.2; Cheng, X.2; Yu, Y.3,4
	2020-06-01
发表期刊	ICARUS
ISSN	0019-1035
卷号	343 页码:6
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).
关键词	Astrometry Satellites, general Neptune, satellites
资助者	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
DOI	10.1016/j.icarus.2020.113662
关键词[WOS]	ASTROMETRIC OBSERVATIONS ; NEPTUNIAN SATELLITES ; POLE
语种	英语
资助项目	National Natural Science Foundation of China[11703007] ; National Natural Science Foundation of China[11573029]
资助者	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
WOS研究方向	Astronomy & Astrophysics
WOS类目	Astronomy & Astrophysics
WOS记录号	WOS:000527007000004
出版者	ACADEMIC PRESS INC ELSEVIER SCIENCE
引用统计	被引频次：5[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://210.72.145.45/handle/361003/9371
专题	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.Huanggang Normal Univ, Sch Phys & Elect Informat, Huanggang 438000, Peoples R China 2.Chinese Acad Sci, Natl Time Serv Ctr, Lintong 710600, Shaanxi, Peoples R China 3.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 4.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 100049, 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.