Ejecting basaltic achondrites from Vesta: Hydrodynamical impact models

Details Ejecting basaltic achondrites from Vesta: Hydrodynamical impact models Ejecting basaltic achondrites from Vesta: Hydrodynamical impact models

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993lpi....24...45a&link_type=abstract

In Lunar and Planetary Inst., Twenty-fourth Lunar and Planetary Science Conference. Part 1: A-F p 45-46 (SEE N94-12015 01-91)

Astronomy and Astrophysics

Astrophysics

1

Achondrites, Basalt, Cratering, Ejecta, Fragmentation, Gravitational Effects, Hydrodynamics, Mathematical Models, Vesta Asteroid, Computerized Simulation, Heterogeneity, Inhomogeneity, Light Curve, Mineral Deposits, Olivine

Scientific paper

Vesta is a large asteroid whose crust is mostly basaltic. Spectral heterogeneity suggests a sizable olivine feature which may be explained as impact excavation. The spectral data probably show a localized feature approximately 200 km in diameter or a diffuse feature approximately 400 km in diameter. Lightcurve irregularities suggest heterogeneity on a similar scale. This heterogeneity may represent the crater bowl, the extent of its ejecta deposit, or indeed something unrelated to cratering. In any case, drawing direct inferences about the state of Vesta's surface on the basis of these observations involves substantial speculation. We are still far from understanding the boundary between cratering and catastrophic disruption, particularly on targets for which strength and self-gravity both matter. But we are now able to model the underlying physical process -- dynamic fragmentation -- accurately with fragmentation hydrocodes such as SALE 2D and SPH3D. We present several impact scenarios for Vesta; our study is similar to a previous impact model for the formation of Stickney crater on Phobos. We illustrate the effects of impactors of different sizes and velocities, and the effect of gravity and structural inhomogeneity.

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