Impact Modeling of Shoemaker Regio and Rahe Dorsum using SPH

Details Impact Modeling of Shoemaker Regio and Rahe Dorsum using SPH Impact Modeling of Shoemaker Regio and Rahe Dorsum using SPH

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003dps....35.3420p&link_type=abstract

American Astronomical Society, DPS meeting #35, #34.20; Bulletin of the American Astronomical Society, Vol. 35, p.1485

Astronomy and Astrophysics

Astronomy

Scientific paper

433 Eros is the best-imaged near-Earth asteroid, but many of the surface features in these images remain enigmatic. Shoemaker Regio, an 8 km diameter boulder-littered depression on the convex side of Eros, may be a degraded impact crater, and is believed to be responsible (Thomas et al., Icarus 155, 18-37) for the ejection of blocks distributed over the surface of the asteroid. Rahe Dorsum is an 18 km long ridge, perhaps circumscribing the asteroid, that is interpreted to be a thrust fault. It is thought to have formed in one of the last major events on Eros, and may be contemporary to Shoemaker Regio (Prockter et al., Icarus 155, 75-93).
Here we present current results of a modeling campaign using a smooth particle hydrodynamics code (SPH; Benz and Asphaug, Comp. Phys. Comm. 87, 253-265) to model an impact at the location of Shoemaker Regio, and the resulting boulder distribution and fracture of Eros-shaped targets with varying internal structural parameters. Initial results show that Rahe Dorsum forms in approximately the observed location as a consequence of the Shoemaker Regio impact, assuming the target was initially a monolithic rocky body.
It is unrealistic, however, to assume that Eros was monolithic in recent time. The largest impact crater on Eros is believed to be Himeros, the saddle structure of the asteroid whose impact formation would have been substantially more devastating. If Shoemaker Regio formed later, then the formation of Rahe Dorsum would occur in a pre-fragmented target.
Work in progress includes (a) modeling the Himeros impact event, into a target with a significantly different initial shape than present-day Eros, and (b) modeling the distribution of boulders ejected during our Shoemaker Regio simulations. The latter is useful in constraining details of the impact which crater diameter alone does not preserve.

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