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Revisiting the Advanced Thermal Physical Model: New Perspectives on Thermophysical Characteristics of (341843) 2008 EV5 from Four-band WISE Data with the Sunlight-reflection Model
Jiang,Haoxuan1,2; Yu,Liangliang3; Ji,Jianghui1,4
2019-10-25
Source PublicationThe Astronomical Journal
ISSN0004-6256
Volume158Issue:5
AbstractAbstract In this paper, we investigate thermophysical characteristics of near-Earth asteroid (341843) 2008 EV5, based on our improved advanced thermal physical model by considering the contribution of sunlight reflection for rough surfaces, along with four waveband observations from the Wide-field Infrared Survey Explorer and the radar-derived shape model. Here we derive that 2008 EV5 has a relatively low thermal inertia of but a high roughness fraction. The geometric albedo and effective diameter are then constrained to be and , respectively. The low thermal inertia indicates that 2008 EV5 may have undergone sufficient space weathering over secular evolution. The high roughness may have resemblance to the appearances of Bennu and Ryugu recently observed by spacecraft, where a great number of boulders are widely distributed on the asteroid’s surface. Moreover, we numerically perform 1000 backward simulations of 2008 EV5's cloned orbits within 1 Myr to explore its origin, and present a probability of ~6.1% that the asteroid originates from the main belt. Finally, we estimate that the mean grain size of the surface ranges from 0.58 to 1.3 mm, and infer that it is unlikely to find water ice on most of the area of 2008 EV5, but there may exist water ice on high latitudes near the polar region.
KeywordNear-Earth objects
DOI10.3847/1538-3881/ab46b4
Language英语
WOS IDIOP:0004-6256-158-5-ab46b4
PublisherThe American Astronomical Society
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/28301
Collection中国科学院紫金山天文台
Affiliation1.CAS Key Laboratory of Planetary Sciences, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, People's Republic of China; jijh@pmo.ac.cn
2.University of Science and Technology of China, Hefei 230026, People's Republic of China
3.State Key Laboratory of Lunar and Planetary Science, Macau University of Science and Technology, Macau, People's Republic of China
4.CAS Center for Excellence in Comparative Planetology, Hefei 230026, People's Republic of China
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GB/T 7714
Jiang,Haoxuan,Yu,Liangliang,Ji,Jianghui. Revisiting the Advanced Thermal Physical Model: New Perspectives on Thermophysical Characteristics of (341843) 2008 EV5 from Four-band WISE Data with the Sunlight-reflection Model[J]. The Astronomical Journal,2019,158(5).
APA Jiang,Haoxuan,Yu,Liangliang,&Ji,Jianghui.(2019).Revisiting the Advanced Thermal Physical Model: New Perspectives on Thermophysical Characteristics of (341843) 2008 EV5 from Four-band WISE Data with the Sunlight-reflection Model.The Astronomical Journal,158(5).
MLA Jiang,Haoxuan,et al."Revisiting the Advanced Thermal Physical Model: New Perspectives on Thermophysical Characteristics of (341843) 2008 EV5 from Four-band WISE Data with the Sunlight-reflection Model".The Astronomical Journal 158.5(2019).
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