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Surface thermophysical properties determination of OSIRIS-REx target asteroid (101955) Bennu
Yu, LiangLiang; Ji, Jianghui
2015-09-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume452Issue:1Pages:368-375
AbstractIn this work, we investigate the thermophysical properties of OSIRIS-REx target asteroid (101955) Bennu (hereafter Bennu), where thermal inertia plays an important role in understanding the nature of the asteroid's surface, and will definitely provide substantial information for the sampling return mission. Using a thermophysical model incorporating, the recently updated 3D radar-derived shape model and mid-infrared observations of Spitzer-PUI, Spitzer-IRAC, Herschel/PACS and ESO VLT/VISIR, we derive the surface thermophysical properties of Bennu. The asteroid has an effective diameter of 510(-40)(+6) m, a geometry albedo of 0.047(-0.0011)(+0.0083), a roughness fraction of 0.04(-0.04)(+0.26) and thermal inertia of 240(-60)(+440) Jm(-2) s(-0.5) K-1 for a best-fitting solution at 1 sigma level. The best-estimate thermal inertia indicates that fine-grained regolith may cover a large area of Bennu's surface, with a grain size that may range from 1.3 to 31 mm, and our outcome further supports that Bennu would be a suitable target for the OSIRIS-REx mission to return samples from the asteroid to Earth.
KeywordRadiation Mechanisms: Thermal Minor Planets, Asteroids: Individual: (101955) Bennu Infrared: General
Subject Area天文和天体物理
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1093/mnras/stv1270
WOS KeywordTHERMAL INFRARED OBSERVATIONS ; 175706 1996 FG3 ; SPECTROSCOPIC SURVEY ; PHYSICAL-PROPERTIES ; MODEL ; LIGHTCURVE ; RQ(36) ; SHAPE
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000360851100028
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/14907
Collection行星科学与深空探测实验室
太阳活动的多波段观测研究团组
AffiliationChinese Acad Sci, Key Lab Planetary Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Yu, LiangLiang,Ji, Jianghui. Surface thermophysical properties determination of OSIRIS-REx target asteroid (101955) Bennu[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2015,452(1):368-375.
APA Yu, LiangLiang,&Ji, Jianghui.(2015).Surface thermophysical properties determination of OSIRIS-REx target asteroid (101955) Bennu.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,452(1),368-375.
MLA Yu, LiangLiang,et al."Surface thermophysical properties determination of OSIRIS-REx target asteroid (101955) Bennu".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 452.1(2015):368-375.
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