A fast ellipsoid model for asteroids inverted from lightcurves

	A fast ellipsoid model for asteroids inverted from lightcurves
	Lu, Xiao-Ping 1; Zhao, Hai-Bin2 ; You, Zhong 1
刊名	RESEARCH IN ASTRONOMY AND ASTROPHYSICS
	2013-04-01
卷号	13 期号:4 页码:471-478
关键词	ellipsoid model lightcurves photometric shape: asteroids
ISSN号	1674-4527
通讯作者	Lu, XP (reprint author), Macau Univ Sci & Technol, Fac Informat Technol, Ave Wai Long, Taipa, Macau, Peoples R China. Email: xplu@must.edu.mo
英文摘要	Research about asteroids has recently attracted more and more attention, especially focusing on their physical structures, such as their spin axis, rotation period and shape. The long distance between observers on Earth and asteroids makes it impossible to directly calculate the shape and other parameters of asteroids, with the exception of Near Earth Asteroids and others that have passed by some space-crafts. Photometric measurements are still generally the main way to obtain research data on asteroids, i.e. the lightcurves recording the brightness and positions of asteroids. Supposing that the shape of the asteroid is a triaxial ellipsoid with a stable spin, a new method is presented in this article to reconstruct the shape models of asteroids from the lightcurves, together with other physical parameters. By applying a special curvature function, the method calculates the brightness integration on a unit sphere and Lebedev quadrature is employed for the discretization. Finally, the method searches for the optimal solution by the Levenberg-Marquardt algorithm to minimize the residual of the brightness. By adopting this method, not only can related physical parameters of asteroids be obtained at a reasonable accuracy, but also a simple shape model of an ellipsoid can be generated for reconstructing a more sophisticated shape model.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	ATMOSPHERELESS BODIES ; BRIGHTNESS VARIATIONS ; RADIATIVE-TRANSFER ; PHASE CURVES ; INVERSION ; SURFACES
收录类别	SCI
语种	英语
WOS记录号	WOS:000316788000008
公开日期	2014-01-08
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/9930]
专题	紫金山天文台_盱眙天文观测站
作者单位	1.Macau Univ Sci & Technol, Fac Informat Technol, Taipa, Macau, Peoples R China 2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
推荐引用方式 GB/T 7714	Lu, Xiao-Ping,Zhao, Hai-Bin,You, Zhong. A fast ellipsoid model for asteroids inverted from lightcurves[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2013,13(4):471-478.
APA	Lu, Xiao-Ping,Zhao, Hai-Bin,&You, Zhong.(2013).A fast ellipsoid model for asteroids inverted from lightcurves.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,13(4),471-478.
MLA	Lu, Xiao-Ping,et al."A fast ellipsoid model for asteroids inverted from lightcurves".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 13.4(2013):471-478.