Grant-in-Aid for Scientific Research (C)
In order to understand the impact cratering on the regolith layer of small bodies, we developed a simulated low gravity collision experiment device and conducted a low speed impact crater formation experiment in the range of 0.01 - 1 G at atmospheric pressure and below 10 Pa. It was found that the crater diameter is proportional to about -0.2 power of gravitational acceleration. We also gained an empirical relationship on the gravitational dependence of the porosity of the granular layer. On the other hand, we experimentally show the case where inter-particle force dominates gravity and even if the gravity decreases, the crater diameter does not become larger as expected. On the other hand, numerical simulation showed that the amount of ejecta from impact cratering does not depend on particle interactions, i.e. restitution coefficient and friction coefficient that lead to energy dissipation.
Trans. JSASS Aerospace Tech. Japan
Space Sci. Rev.
Journal of Geophysical Research
The Astrophysical Journal
Planetary and Space Science
Planet. Space Sci
Adv. Space Res.
Planet. Space Sci.
Meteoritics and Planetary Science
Astrophysical Journal Letter
Astronomy and Astrophysics
Volume: (印刷中)(oin press)(未定)
Attribution of KAKENHI