Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991plas.rept..174o&link_type=abstract
In NASA, Washington, Reports of Planetary Astronomy, 1991 p 174 (SEE N92-12792 03-89)
Astronomy and Astrophysics
Astronomy
Asteroids, Meteoritic Composition, Radar Astronomy, Radar Tracking, Abundance, Collisions, Economics, Ejecta, Gold, Hypotheses, Iron, Nickel, Observatories, Platinum
Scientific paper
Radar 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 1016 g of iron, 10 15 g of nickel, 1011 g of platinum group metals, and 1010 g of gold.
Campbell Don B.
Chandler John F.
Hine Alice A.
Hudson Raymond Scott
Ostro Steven J.
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