Spin rates of fast-rotating asteroids and fragments in impact disruption

Details Spin rates of fast-rotating asteroids and fragments in impact disruption Spin rates of fast-rotating asteroids and fragments in impact disruption

Apr 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009icar..200..694k&link_type=abstract

Icarus, Volume 200, Issue 2, p. 694-697.

Physics

1

Scientific paper

We present a new experimental result of fragment spin-rate in impact disruption, using a thin glass plate. A cylindrical projectile impacts on a side (edge) of the plate. Dispersed fragments are observed using a high-speed camera and the spin rates of fragments are measured. We find that the measured fragment spin-rate decreases with increasing size. Assuming that the rotational energy of fragments is supplied from the residual stress, the spin rate ω decreases with increasing fragment size r as ω˜r, which explains the above experimental results. This size-dependence is similar to that of the observed spin rates of small fast-rotating asteroids. Our results suggest that spin rates of fragments of small asteroids immediately after disruption may have a similar size-dependence, and can provide constraints on the subsequent spin-state evolution of small asteroids due to thermal torques.

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