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The Elemental Composition of Asteroid 433 Eros: Results of the NEAR-Shoemaker X-ray Spectrometer
J. I. Trombka,1*S. W. Squyres,2J. Brückner,3W. V. Boynton,4R. C. Reedy,5T. J. McCoy,6P. Gorenstein,7L. G. Evans,8J. R. Arnold,9R. D. Starr,10L. R. Nittler,1M. E. Murphy,10I. Mikheeva,4R. L. McNutt Jr.,11T. P. McClanahan,1E. McCartney,2J. O. Goldsten,11R. E. Gold,11S. R. Floyd,1P. E. Clark,10T. H. Burbine,6J. S. Bhangoo,4S. H. Bailey,4M. Petaev7
We report major element composition ratios for regions
of the asteroid 433 Eros imaged during two solar flares and quiet sunconditions during the period of May to July 2000. Low aluminumabundances for all regions argue against global differentiationof
Eros. Magnesium/silicon, aluminum/silicon, calcium/silicon,and
iron/silicon ratios are best interpreted as a relatively primitive,chondritic composition. Marked depletions in sulfur and possiblealuminum and calcium depletions, relative to ordinary chondrites,may
represent signatures of limited partial melting or impactvolatilization.
1 Goddard Space Flight Center, Code 691, Greenbelt, MD 20771, USA.
2 Space Sciences Building,
Cornell University, Ithaca, NY 14853, USA.
3 Max-Planck-Institut für Chemie, Postfach
3060, D-55020 Mainz, Germany.
4 Department of
Planetary Science, Space Sciences Building, University of Arizona,
Tucson, AZ 85721, USA.
5 Los Alamos National
Laboratory, NIS-2, MS-D436, Los Alamos, NM 87545, USA.
6 Department of Mineral Sciences, National Museum of
Natural History, Smithsonian Institution, Washington, DC 20560-0119,
USA.
7 Smithsonian Astrophysical Observatory, 60 Garden Street, MS-4, Cambridge, MA 02138, USA.
8 System Sciences Division, Computer Sciences
Corporation, 1100 West Street, Laurel, MD 20707, USA.
9 University of California, San Diego, Chemistry
BC-017/Cal Space 0524, 9500 Gillman Drive, La Jolla, CA 92093, USA.
10 Physics Department, Catholic University of
America, 620 Michigan Avenue NE, Washington, DC 20064, USA.
11 Applied Physics Laboratory, Johns Hopkins
University, Johns Hopkins Road, Laurel, MD 20723, USA.
*
To whom correspondence should be addressed.
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[DOI: 10.1126/science.289.5487.2065] |Summary »|Full Text »
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[DOI: 10.1126/science.289.5487.2085] |Abstract »|Full Text »|PDF »
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[DOI: 10.1126/science.289.5487.2088] |Abstract »|Full Text »|PDF »
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[DOI: 10.1126/science.289.5487.2097] |Abstract »|Full Text »|PDF »
