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Shape, thermal and surface properties determination of a candidate spacecraft target asteroid (175706) 1996 FG3
Yu, LiangLiang1,2; Ji, Jianghui1; Wang, Su1
2014-04-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume439Issue:4Pages:3357-3370
AbstractIn this paper, a 3D convex shape model of (175706) 1996 FG3, which consists of 2040 triangle facets and 1022 vertices, is derived from the known light curves. The best-fitting orientation of the asteroid's spin axis is determined to be lambda = 237 degrees.7 and beta = -83 degrees.8 considering the observation uncertainties, and its rotation period is similar to 3.5935 h. Using the derived shape model, we adopt the so-called advanced thermophysical model (ATPM) to fit three published sets of mid-infrared observations of 1996 FG3, so as to evaluate its surface properties. Assuming the primary and the secondary bear identical shape, albedo, thermal inertia and surface roughness, the best-fitting parameters are obtained from the observations. The geometric albedo and effective diameter of the asteroid are reckoned to be p(v) = 0.045 +/- 0.002, D-eff = 1.69(-0.02)(+0.05) km. The diameters of the primary and secondary are determined to be D-1 = 1.63(-0.03)(+0.04) km, respectively. The surface thermal inertia Gamma is derived to be a low value of 80 +/- 40 Jm(-2) s(-0.5) K-1 with a roughness fraction f(R) of 0.8(-0.4)(+0.2). This indicates that the primary possibly has a regolith layer on its surface, which is likely to be covered by a mixture of dust, fragmentary rocky debris and sand. The minimum regolith depth is estimated to be 5-20 mm from the simulations of subsurface temperature distribution, indicating that 1996 FG3 could be a very suitable target for a sample return mission.
KeywordRadiation Mechanisms: Thermal Minor Planets, Asteroids: Individual: (175706)1996fg3 Infrared: General
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1093/mnras/stu164
WOS KeywordNEAR-EARTH ASTEROIDS ; PHYSICAL-CHARACTERIZATION ; BINARY ASTEROIDS ; INFRARED OBSERVATIONS ; LIGHTCURVE INVERSION ; OPTIMIZATION METHODS ; BACKUP TARGET ; MARCOPOLO-R ; MODEL ; MISSION
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Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000334115400013
Citation statistics
Cited Times:10[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/10701
Collection行星科学与深空探测实验室
Affiliation1.Chinese Acad Sci, Key Lab Planetary Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Yu, LiangLiang,Ji, Jianghui,Wang, Su. Shape, thermal and surface properties determination of a candidate spacecraft target asteroid (175706) 1996 FG3[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2014,439(4):3357-3370.
APA Yu, LiangLiang,Ji, Jianghui,&Wang, Su.(2014).Shape, thermal and surface properties determination of a candidate spacecraft target asteroid (175706) 1996 FG3.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,439(4),3357-3370.
MLA Yu, LiangLiang,et al."Shape, thermal and surface properties determination of a candidate spacecraft target asteroid (175706) 1996 FG3".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 439.4(2014):3357-3370.
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