Impact Excavation on Asteroid 4 Vesta: Hubble Space Telescope Results-Reference-Cited by-同舟云学术

Impact Excavation on Asteroid 4 Vesta: Hubble Space Telescope Results

Published:1997-09-05 Issue:5331 Volume:277 Page:1492-1495
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Thomas Peter C.¹²³⁴⁵,Binzel Richard P.¹²³⁴⁵,Gaffey Michael J.¹²³⁴⁵,Storrs Alex D.¹²³⁴⁵,Wells Eddie N.¹²³⁴⁵,Zellner Benjamin H.¹²³⁴⁵

Affiliation:

1. P. C. Thomas, Center for Radiophysics and Space Research, Cornell University, Ithaca, NY 14853, USA.

2. R. P. Binzel, Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

3. M. J. Gaffey, Department of Earth and Environmental Sciences, Rensselaer Polytechnic Institute, Troy, NY 12181, USA.

4. A. D. Storrs, Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA.

5. E. N. Wells, Astronomy Programs, Computer Sciences Corporation, Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA.

Abstract

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.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference61 articles.

1. Vesta is the third largest asteroid with a mean diameter of 530 km (P. C. Thomas et al. Icarus in press). All other known basaltic asteroids are <10 km in diameter.

2. At its closest distance in May 1996 Vesta was 1.17 AU from Earth within 0.03 AU of its closest possible approach. At that time its apparent diameter was 0.62 arc sec or about 15 pixels across as viewed with WFPC2.

3. Chips off of Asteroid 4 Vesta: Evidence for the Parent Body of Basaltic Achondrite Meteorites

4. B. H. Zellner et al. Icarus in press.

5. The 1996 data were obtained through filters F439W (wavelength of 0.439 μm) F673N (0.673 μm) F791N (0.791 μm) F953N (0.953 μm) and F1042M (1.042 μm) at solar phase angles of about 5°.

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