Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27....1a&link_type=abstract
Lunar and Planetary Science, volume 27, page 1
Astronomy and Astrophysics
Astrophysics
3
Collisions: Disruptions: Collisional: Impacts: Impacts: Gravity Scaling In: Impacts: Strength Scaling In
Scientific paper
The response of centimeter-scale laboratory impact experiment targets to catastrophic collisions (those removing ~50% of the target's mass) is governed by material strength, while the impact behavior of Mm-scale planetary bodies depends on gravity. The boundary between strength and gravity dominance in catastrophic impacts lies at some intermediate size; estimates of that size for silicate bodies range from ~6 km to ~100 km diameter. We extrapolate our new Smoothed Particle Hydrodynamics (SPH) catastrophic impact simulation results for 10-1000-km-diameter bodies to smaller sizes, yielding a new estimate of the boundary diameter: 250 +/- 150 m. The uncertainty reflects incomplete understanding of how strength decreases with increasing target size. The catastrophic impact specific energies (Q*) at these sizes are ~40 to ~200 J/kg. Our results imply that most numbered asteroids are gravity dominated, that bodies <1 km across may be gravity bound rubble piles as well as monoliths, and that kilometer-sized Earth-approaching asteroids may have disruption energies higher than previously estimated.
Ahrens Thomas J.
Love Stanley G.
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