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Asteroid 1986 DA: Radar evidence for a metallic compositionRadar observations of the near-Earth asteroid 1986 DA were carried out at the Arecibo Observatory in April 1986, two months after its discovery. Radar results are consistent with the hypothesis that 1986 HA is a piece of NiFe metal derived from the interior of a much larger object that melted, differentiated, cooled and subsequently was disrupted in a catastrophic collision. This 2-km asteroid might be (or have been part of) the parent body of some iron meteorites. Or 1986 DA might share the parentage and/or part of the dynamical history of some meteorites without ever having contributed any of its own ejecta to our meteorite sample. Analysis of the samples returned from 1986 DA might ultimately involve economic considerations. Meteoritic metal is mostly iron with about 8 percent nickel, but also contains substantial concentrations of precious and strategic metals, including approx. 1 ppm of gold and approx. 10 ppm of platinum group elements. If these abundances apply to 1986 DA, it contains some 10(exp 16) g of iron, 10 (exp 15) g of nickel, 10(exp 11) g of platinum group metals, and 10(exp 10) g of gold.
Document ID
Document Type
Ostro, Steven J.
(Jet Propulsion Lab. California Inst. of Tech., Pasadena., United States)
Campbell, D. B.
(Cornell Univ. New York, NY., United States)
Chandler, J. F.
(Smithsonian Astrophysical Observatory Cambridge, MA., United States)
Hine, A. A.
(Arecibo Ionospheric Observatory Richland., United States)
Hudson, R. S.
(Washington State Univ. California Inst. of Tech., Pasadena., United States)
Rosema, K. D.
(Jet Propulsion Lab. Cambridge, MA., United States)
Shapiro, Irwin I.
(Smithsonian Astrophysical Observatory)
Date Acquired
September 6, 2013
Publication Date
October 1, 1991
Publication Information
Publication: NASA, Washington, Reports of Planetary Astronomy, 1991
Subject Category
Distribution Limits
Work of the US Gov. Public Use Permitted.

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