Dawn at Vesta: Testing the Protoplanetary Paradigm-Reference-Cited by-同舟云学术

Dawn at Vesta: Testing the Protoplanetary Paradigm

Published:2012-05-11 Issue:6082 Volume:336 Page:684-686
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Russell C. T.¹,Raymond C. A.²,Coradini A.³,McSween H. Y.⁴,Zuber M. T.⁵,Nathues A.⁶,De Sanctis M. C.³,Jaumann R.⁷,Konopliv A. S.²,Preusker F.⁷,Asmar S. W.²,Park R. S.²,Gaskell R.⁸,Keller H. U.⁶,Mottola S.⁷,Roatsch T.⁷,Scully J. E. C.⁹,Smith D. E.⁵,Tricarico P.⁸,Toplis M. J.¹⁰,Christensen U. R.⁶,Feldman W. C.⁸,Lawrence D. J.¹¹,McCoy T. J.¹²,Prettyman T. H.⁸,Reedy R. C.⁸,Sykes M. E.⁸,Titus T. N.¹³

Affiliation:

1. Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095–1567, USA.

2. Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA.

3. Istituto di Astrofisica e Planetologia Spaziali, Istituto Nazionale di Astrofisica, Rome, Italy.

4. Department of Earth and Planetary Sciences, University of Tennessee, Knoxville, TN 37996–1410, USA.

5. Massachussetts Institute of Technology, Cambridge, MA 02139–4307, USA.

6. Max-Planck-Institut fur Sonnensystemforschung, Katlenburg-Lindau, Germany.

7. Institute of Planetary Research, DLR, Berlin, Germany.

8. Planetary Science Institute, Tucson, AZ 85719, USA.

9. Department of Earth and Space Sciences, University of California, Los Angeles, CA 90095–1567, USA.

10. Institut de Recherche en Astrophysique et Planetologie, Université de Toulouse, France.

11. Johns Hopkins University Applied Physics Laboratory, Laurel, MD 20723, USA.

12. Smithsonian Institution, Washington, DC 20560, USA.

13. U.S. Geological Survey, Flagstaff, AZ 86001, USA.

Abstract

A New Dawn Since 17 July 2011, NASA's spacecraft Dawn has been orbiting the asteroid Vesta—the second most massive and the third largest asteroid in the solar system (see the cover). Russell et al. (p. 684 ) use Dawn's observations to confirm that Vesta is a small differentiated planetary body with an inner core, and represents a surviving proto-planet from the earliest epoch of solar system formation; Vesta is also confirmed as the source of the howardite-eucrite-diogenite (HED) meteorites. Jaumann et al. (p. 687 ) report on the asteroid's overall geometry and topography, based on global surface mapping. Vesta's surface is dominated by numerous impact craters and large troughs around the equatorial region. Marchi et al. (p. 690 ) report on Vesta's complex cratering history and constrain the age of some of its major regions based on crater counts. Schenk et al. (p. 694 ) describe two giant impact basins located at the asteroid's south pole. Both basins are young and excavated enough amounts of material to form the Vestoids—a group of asteroids with a composition similar to that of Vesta—and HED meteorites. De Sanctis et al. (p. 697 ) present the mineralogical characterization of Vesta, based on data obtained by Dawn's visual and infrared spectrometer, revealing that this asteroid underwent a complex magmatic evolution that led to a differentiated crust and mantle. The global color variations detailed by Reddy et al. (p. 700 ) are unlike those of any other asteroid observed so far and are also indicative of a preserved, differentiated proto-planet.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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