Investigation of Thermal Inertia and Surface Properties for Near-earth Asteroid (162173) 1999 JU3 |
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| Authors: | YU Liang-liang JI Jiang-hui WANG Su |
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| Institution: | 1. Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008;2. Key Laboratory of Planet Sciences, Chinese Academy of Sciences, Nanjing 210008;3. University of Chinese Academy of Sciences, Beijing 100049 |
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| Abstract: | In order to obtain the substantial information about the surface physics and thermal property of the target asteroid (162173) 1999 JU3, which will be visited by Hayabusa 2 in a sample return mission, with the Advanced Thermal Physical Model (ATPM) we estimate the possible thermal inertia distribution over its surface, and infer the major material composition of its surface materials. In addition, the effective diameter and geometric albedo are derived to be Deff = 1.13 ± 0.03 km, pv = 0.042 ± 0.003, respectively, and the average thermal inertia is estimated to be about (300 ± 50) J m-2 s-0.5 K-1 According to the derived thermal inertia distribution, we infer that the major area on the surface of the target asteroid may be covered by loose materials, such as rock debris, sands, and so on, but few bare rocks may exist in a very small region. In this sense, the sample return mission of Hayabusa 2 is feasible, when it is performed successfully, it will certainly bring significant scientific information to the research of asteroids. |
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| Keywords: | asteroids individual 1999 JU3 methods numerical |
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