Complete fragmentation of the parent bodies of Themis,Eos, and Koronis families |
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| Authors: | Akira Fujiwara |
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| Institution: | Department of Physics, Kyoto University, Kyoto 606, Japan |
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| Abstract: | The fragmentation of the parent asteroids of the Themis, Eos, and Koronis families is investigated by considering mutual gravitational effects among the fragmented bodies. The masses of the parent asteroids and the kinetic and gravitational energies of the fragmented bodies are estimated. Comparison of these results and data from the laboratory impact experiments leads to the conclusion that the parent asteroids of the three families were completely fragmented at Ep/M of 108 erg/g or more (Ep, impact energy; M, parent mass). However, since most of the fragments had low relative velocities many reaccumulated through mutual gravitation. The larger members in these families should have the rubble pile structures and hydrostatic equilibrium figures. |
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