2010 Fiscal Year Final Research Report
Geological processes under an extremely small gravity : Effects of seismic-shaking
| Project/Area Number |
20684019
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| Research Category |
Grant-in-Aid for Young Scientists (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
Solid earth and planetary physics
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| Research Institution | The University of Tokyo |
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Principal Investigator |
MIYAMOTO Hideaki The University of Tokyo, 総合研究博物館, 准教授 (00312992)
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| Project Period (FY) |
2008 – 2010
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| Keywords | 小惑星 / レゴリス / 惑星探査 / 粉体 / 数値シミュレーション |
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| Research Abstract |
Detailed geological study of close-up images obtained by Hayabusa spacecraft reveal that some of the gravels hold bright spot, which indicate the age of surface blocks is 1-10Ma. This supports our view that the surface gravel is migrating occasionally on the surface of the asteroid Itokawa. We developed a numerical simulation code of three-dimensional rock particles with irregular shapes and find that the gravels in the close-up images obtained by Hayabusa spacecraft are geometrically saturated and thus their size-frequency distributions should be carefully used to discuss the internal structure of Itokawa. Also, we newly develop a theoretical model of migrations of gravels including electro-statically levitated fine particles. Our theoretical model indicates that the smoothness of Saturnian satellite, Atlas, can be explained by dust levitations, which might be the dominant resurfacing process on the surface of this satellite. This indicates that dust levitation can be another important global-scale resurfacing under an extremely small gravity.
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Research Products
(26 results)
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[Journal Article] Surface morphological features of boulders on Asteroid 25143 Itokawa2010
Author(s)
Noguchi T, Tsuchiyama A, Hirata N, Demura H, Nakamura R, Miyamoto H, Yano H, Nakamura T, Saito J, Sasaki S, HashimotoT, Kubota T, Ishiguro M,, Zolensky ME
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Journal Title
Icarus 206
Pages: 319-326
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[Journal Article] マイケル・E・ゾレンスキー,小惑星イトカワ表面に存在する岩塊の表面組織の解読～小惑星のフィールド岩石学の試み～2010
Author(s)
野口高明, 平田成, 土'山明, 出村裕英, 中村良介, 宮本英昭, 矢野創, 中村智樹, 齋藤潤, 佐々木晶, 橋本樹明, 久保田孝, 石黒正晃
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Journal Title
日本惑星科学会学会誌 19
Pages: 12-22
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[Journal Article] The sedimentology and dynamics of crater-affiliated wind streaks in western Arabia Terra, Mars and Patagonia2010
Author(s)
Rodriguez, JAP, Tanaka, K.L., Berman, D.C., Zimbelman, J.R, Kargel, J.S., Sasaki, S., Yan, J.G., Miyamoto, H.
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Journal Title
Argentina, Geomorphology 121
Pages: 30-54
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[Journal Article] A survey of possible impact structures on 25143 Itokawa2009
Author(s)
Hirata N, Barnouin-jha, O.S., Honda, C., Nakamura R., Miyamoto, H. Sasaki, S., Demura, H., nakamura, A.M., Michikami, T., Gaskell, R.W., Saito, J.
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Journal Title
Icarus 200
Pages: 486-502
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[Journal Article] Long-lived volcanism on the lunar farside revealed by SELENE terrain camera2009
Author(s)
Haruyama, J., Ohtake, M., Matsunaga, T., Morota, T., Honda, C., Yokota, Y., Abe, M., Ogawa, Y., Miyamoto, Iwasaki, A., et al.
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Journal Title
Science 323
Pages: 905-908
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[Journal Article] Lack of exposed ice inside lunar south pole Shackleton Crater2008
Author(s)
Haruyama, J., Ohtake, M., Matsunaga, T., Morota, T., Honda, C., Yokota, Y., Pieters, C.M., Hara, S., Hiroki, K., Saiki, K., Miyamoto, H., Iwasaki, A., et al.
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Journal Title
Science 322
Pages: 938-939
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[Presentation] Surface morphological features of boulders on Asteroid 25143 Itokawa2010
Author(s)
Noguchi, T., Tsuchiyama, A., Hirata, N., Demura, H., Nakamura, R., Mimoto, H., Yano, H., Nakamura, T., Saito, J., Sasaki, S.
Organizer
Lunar and Planetary Science Conference
Place of Presentation
米国
Year and Date
20100300
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[Presentation] Geologic processes on the surface of a small asteroid Itokawa2008
Author(s)
Hirata, N., S.Abe, M.Ishiguro, K.Kitazato, R.Nakamura, H.Miyamoto,, H.Demura, M.Abe, S.Sasaki, S.
Organizer
71st Annual meeting of Meteoritical Society
Place of Presentation
松江
Year and Date
2008-07-30
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[Remarks] ホームページ等
