Mathematics
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994metic..29r.469g&link_type=abstract
Meteoritics (ISSN 0026-1114), vol. 29, no. 4, p. 469-470
Mathematics
11
Chondrites, Fireballs, Mathematical Models, Meteoritic Composition, New York, Weathering, Cosmic Rays, Meteorite Collisions, Radioactive Isotopes, Rare Gases
Scientific paper
On October 9, 1992, a bright fireball traveled some 700 km over the northeastern United States. It fragmented repeatedly into about 70 pieces, and one 12.4-kg H6 chondrite was recovered in Peekskill, New York. The event was recorded on several video cameras, which provided the informtion required to determine the original orbit of the object. A collaborative study of the exposure history based on measurements of radionuclides, nobel gases, and cosmic ray tracks was undertaken. All measurements were carried out on samples from the same 12.4-kg piece, and measurements of He, Ne, Ar, C-14, Be-10, Al-26, and Cl-36 were carried out on adjacent samples. Calculated exposure ages based on He-3, Ne-21, and Ar-38 data and normal production rates agree well, and an average of 27 Ma is obtained. The exposure time is long enough for all investigated radionuclides to be in secondary equilibrium. Upper bonds are obtained from measured Be-10 activities of 17.21 dpm/kg, which appear low for a sample from the center of a 50-cm meteoroid. The model calculations for a sample depth of 20-40 cm in a body with preatmospheric radius of approximately 100 would fit the observed Be-10 activity as well as the Ne-22/Ne-21 ratio of 1.078. Using this upper limit for the preatmospheric size, the production rates of He, Ne, and Ar would have to be revised downward, and at present we cannot exclude the possibility that Peekskill is a member of the 33-Ma collisional event recorded in the exposure age distribution of the H chondrites. Also, with the data at hand, complexities in the exposure history cannot be ruled out.
Andrews H. R.
Cornett J. J. R.
Davies Glenn W.
Graf Th.
Greiner B. F.
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