H and L Chondrite Clusters and Streams

Details H and L Chondrite Clusters and Streams H and L Chondrite Clusters and Streams

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992metic..27q.214d&link_type=abstract

Meteoritics, vol. 27, no. 3, volume 27, page 214

Computer Science

4

Scientific paper

Recent reports of streams of fireballs and Amor asteroids encourage efforts to identify recovered meteorites that traveled together in space. Study of such meteorites may illuminate many questions, e.g., the structures of parent bodies, constancy, or variation of the meteoroid flux, the significance of varied cosmogenic nuclide trends, and the cogenesis or separate formation of various groups of C and E meteorites. The year-day distribution of H chondrites includes 17 meteorites that fell in mid-May (days 132 to 147) between 1855 and 1895. Such a concentration, which corresponds to 11 falls in a 30-year by 15-day period, was observed in only one of 1000 sets of random year-day pairs that were generated for comparison with the H chondrite data. It is thus most unlikely that the cluster of May falls arose by chance. A plot of solar distances (corrected for precession Figure 1) suggests that the H cluster samples two closely spaced and probably related meteoroid streams. Six meteorites of types 3 to 6, which fell between 12 and 17 May, sample stream 1A. Ten meteorites of types 4 to 6, which fell between 21 and 27 May, sample stream 1B. Both the pattern of encounter (Figure 2) and a high proportion of falls in the Earth's apical hemisphere suggest that stream 1B was encountered near its perihelion, where its geocentric velocity was unusually low. Prevalence of early afternoon falls in stream 1A suggests an encounter slightly off perihelion. A concentration of L chondrite falls in June and July (days 170 to 205) between 1903 and 1927 is stronger than the H concentration and even harder to reconcile with a random distribution of meteoroids. This L cluster appears to sample four closely spaced meteoroid streams, which were encountered at and near the Earth's aphelion.

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