Thermal modeling for a parent body of Itokawa |
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| Authors: | S Wakita T Nakamura T Ikeda H Yurimoto |
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| Institution: | 1. Department of Earth and Planetary Materials Science, Faculty of Science, Tohoku University, , Sendai, Miyagi, 980‐8578 Japan;2. Center for Computational Astrophysics, National Astronomical Observatory of Japan, , Mitaka, Tokyo, 181‐8588 Japan;3. Department of Earth and Planetary Science, Faculty of Science, Kyushu University, , Higashi‐ku, Fukuoka, 812‐8581 Japan;4. Natural History Sciences, Hokkaido University, , Sapporo, Hokkaido, 060‐0810 Japan |
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| Abstract: | We modeled the possible parent bodies of Itokawa, which was heated within by the decay energy of 26Al. Based on mineralogic studies of dust particles derived from Itokawa by the Hayabusa spacecraft, it appeared that they were thermally metamorphosed at a peak temperature of 800 °C, and kept at 700 °C or higher at 7.6 Myr after CAI formation. Our numerical results show that the parent bodies of Itokawa would have been larger than 20 km in radius and accreted at a period between 1.9 and 2.2 Myr after CAI formation, to satisfy mineralogic and isotopic evidence from dust particles. |
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