Determination of the free lunar libration modes from ephemeris DE430

doi:10.1088/1674-4527/17/12/127

CORC > 上海天文台 > 中国科学院上海天文台

	Determination of the free lunar libration modes from ephemeris DE430
	Yang, Yong-Zhang 2,3,4; Li, Jin-Ling 2,4; Ping, Jin-Song 2,3; Hanada, Hideo 1
刊名	RESEARCH IN ASTRONOMY AND ASTROPHYSICS
	2017-12-01
卷号	17 期号:12
关键词	Moon Physical Librations Fourier Analysis Least Squares Method
ISSN号	1674-4527
DOI	10.1088/1674-4527/17/12/127
英文摘要	The Moon's physical librations have been extensively studied, and elaborate researches have been developed for the purpose of deriving accurate modes of free librations. Our motivation comes from the Planetary and Lunar Ephemeris DE430 by JPL/NASA, which was created in April 2013, and is reported to be the most accurate lunar ephemeris today using the data from Gravity Recovery and Interior Laboratory (GRAIL). Therefore, the residuals after fitting the model have reduced owing to improvement in the libration models, and the free librations embedded in the Euler angles have also improved. We use Fourier analysis to extract the approximate frequencies from DE430 and then a quadratic interpolation method is used to determine higher accuracy frequencies. With the frequencies, the linear least-squares fitting method is employed to fit the lunar physical librations to DE430. From this analysis we identified the three modes of free physical librations, and estimated the amplitudes as 1.471'' in longitude, 0.025'' in latitude and 8.19'' x 3.31'' for the wobble, with the respective periods of 1056.16, 8806.9 and 27262.99 d. Since the free librations damp with time, they require recent excitation or a continuous stimulating mechanism in order to sustain.
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	NATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
WOS记录号	WOS:000419673300009
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/32519]
专题	中国科学院上海天文台
通讯作者	Yang, Yong-Zhang
作者单位	1.Natl Astron Observ Japan, RISE Project, Oshu 0230861, Japan 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 4.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
推荐引用方式 GB/T 7714	Yang, Yong-Zhang,Li, Jin-Ling,Ping, Jin-Song,et al. Determination of the free lunar libration modes from ephemeris DE430[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2017,17(12).
APA	Yang, Yong-Zhang,Li, Jin-Ling,Ping, Jin-Song,&Hanada, Hideo.(2017).Determination of the free lunar libration modes from ephemeris DE430.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,17(12).
MLA	Yang, Yong-Zhang,et al."Determination of the free lunar libration modes from ephemeris DE430".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 17.12(2017).