TY - GEN
T1 - Shape and distribution of rubble-pile asteroid with impact
AU - Miwa, Yuichi
AU - Yano, Hajime
AU - Morimoto, Mutsuko
AU - Mori, Osamu
AU - Kawaguchi, Jun'Ichiro
PY - 2008/12/1
Y1 - 2008/12/1
N2 - The asteroid exploration spacecraft "HAYABUSA" took high resolution pictures of asteroid "ITOKAWA". ITOKAWA is a rubble-pile asteroid, whose shape and regolith size distribution are unique. These features are caused by composition of the Brazil-Nut effect and centrifugal force by spin. The Brazil-Nut effect is generally known as the phenomenon that causes larger particles to rise to the top of the shaken granular mixtures. In this study, the behaviors of various size particles on the ground or in the space are analyzed by numerical simulation using Multi-Particle model, which is model of a rubble-pile asteroid. At first, the behaviors of particles on the ground are simulated, and it is confirmed that Brazil-Nut effect occurs. Next, the behaviors of particles in the space are simulated. From this simulation results, the internal distribution of particles' upward trend is obtained. It is compared with the known information of ITOKAWA, and the inferred internal structure of rubble-pile asteroid is discussed.
AB - The asteroid exploration spacecraft "HAYABUSA" took high resolution pictures of asteroid "ITOKAWA". ITOKAWA is a rubble-pile asteroid, whose shape and regolith size distribution are unique. These features are caused by composition of the Brazil-Nut effect and centrifugal force by spin. The Brazil-Nut effect is generally known as the phenomenon that causes larger particles to rise to the top of the shaken granular mixtures. In this study, the behaviors of various size particles on the ground or in the space are analyzed by numerical simulation using Multi-Particle model, which is model of a rubble-pile asteroid. At first, the behaviors of particles on the ground are simulated, and it is confirmed that Brazil-Nut effect occurs. Next, the behaviors of particles in the space are simulated. From this simulation results, the internal distribution of particles' upward trend is obtained. It is compared with the known information of ITOKAWA, and the inferred internal structure of rubble-pile asteroid is discussed.
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M3 - Conference contribution
AN - SCOPUS:77950489504
SN - 9781615671601
T3 - International Astronautical Federation - 59th International Astronautical Congress 2008, IAC 2008
SP - 4445
EP - 4453
BT - International Astronautical Federation - 59th International Astronautical Congress 2008, IAC 2008
T2 - 59th International Astronautical Congress 2008, IAC 2008
Y2 - 29 September 2008 through 3 October 2008
ER -