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Science 5 September 1997:
Vol. 277. no. 5331, pp. 1492 - 1495
DOI: 10.1126/science.277.5331.1492
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Reports
Impact Excavation on Asteroid 4 Vesta: Hubble Space Telescope Results
Peter C. Thomas,
*
Richard P. Binzel,
Michael J. Gaffey,
Alex D. Storrs,
Eddie N. Wells,
Benjamin H. Zellner
Hubble Space Telescope images of asteroid 4 Vesta obtained during
the favorable 1996 apparition show an impact crater 460 kilometers in
diameter near the south pole. Color measurements within the
13-kilometer-deep crater are consistent with excavation deep into a
high-calcium pyroxene-rich crust or olivine upper mantle. About 1 percent of Vesta was excavated by the crater formation event, a volume
sufficient to account for the family of small Vesta-like asteroids that
extends to dynamical source regions for meteorites. This crater may be
the site of origin for the howardite, eucrite, and diogenite classes of
basaltic achondrite meteorites.
P. C. Thomas, Center for Radiophysics and Space Research,
Cornell University, Ithaca, NY 14853, USA.
R. P. Binzel, Department of Earth, Atmospheric, and Planetary
Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
M. J. Gaffey, Department of Earth and Environmental Sciences,
Rensselaer Polytechnic Institute, Troy, NY 12181, USA.
A. D. Storrs, Space Telescope Science Institute, 3700 San Martin
Drive, Baltimore, MD 21218, USA.
E. N. Wells, Astronomy Programs, Computer Sciences Corporation,
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD
21218, USA.
B. H. Zellner, Department of Physics, Georgia Southern University,
Statesboro, GA 30460, USA.
*
To whom correspondence should be addressed.
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- Discovery of a Basaltic Asteroid in the Outer Main Belt.
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