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Title: Excavating Stickney crater at Phobos

Stickney crater, at 9 km across, dominates the morphology of ~22 km Phobos, the larger of the two moons of Mars. The Stickney impact event had global repercussions for Phobos, including extensive resurfacing and fracturing of the moon. Understanding the initial conditions and dynamical consequences of the collision is necessary to test competing hypotheses for the origin of peculiar grooved terrain that striates much of the surface. Previous modeling of the impact event was unable to replicate Stickney without globally fragmenting the satellite. We also describe high-resolution numerical simulations that successfully generate Stickney crater while maintaining the large-scale structure of Phobos. Target porosity, which is estimated to be significant, aids in keeping the moon intact. Damage follows patterns centered on Stickney that are inconsistent with the observed alignment of grooved terrain on Phobos. We ejected low-velocity boulders at shallow angles in sufficient numbers to support a rolling-boulder origin for grooved terrain.
Authors:
 [1] ;  [2] ;  [1] ;  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Yale Univ., New Haven, CT (United States). Dept. of Physics
Publication Date:
Report Number(s):
LLNL-JRNL-696904
Journal ID: ISSN 0094-8276
Grant/Contract Number:
AC52-07NA27344; 12-ERD-005; LLNL-JRNL-696904
Type:
Accepted Manuscript
Journal Name:
Geophysical Research Letters
Additional Journal Information:
Journal Volume: 43; Journal Issue: 20; Journal ID: ISSN 0094-8276
Publisher:
American Geophysical Union
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES
OSTI Identifier:
1336990
Alternate Identifier(s):
OSTI ID: 1402385