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Volumn 277, Issue 5331, 1997, Pages 1492-1495

Impact excavation on asteroid 4 Vesta: Hubble Space Telescope results

Author keywords

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Indexed keywords

CALCIUM;

EID: 0030752720     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.277.5331.1492     Document Type: Article
Times cited : (288)

References (58)
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    • 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.
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    • 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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    • The largest fragment is estimated to be 10 km across. Whether it has the structure of a single coherent fragment or a gravitationally bound group of fragments is unknown, although a conglomerate composition for Vesta fragments is suggested by coincident exposure age peaks for the categories of HED meteorites, as found by O. Eugster and T. Michel (Geochim. Cosmochim. Acta 59, 177 (1995)].
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    • note
    • Based on observations made by the NASA/European Space Agency Hubble Space Telescope, obtained at the Space Telescope Science Institute (STScl), which is operated by the Association of Universities for Research in Astronomy Inc., under NASA contract NAS 5-26555. Supported in part by STScl grant GO-6481. Helpful suggestions were made by M. Zuber and H. J. Melosh.


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