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- W3042874640 abstract "Two photographic networks, designed to acquire orbital and trajectory data on meteors and impact points of meteorites occurring during night-time hours, have been in operation in the U.S.A. and Czechoslovakia since 1964. More than 100 meteors brighter than -9 mag have been photographed by more than one station. The major result to date is the fact that bright fireballs occur far more frequently than expected; paradoxically, the meteorite rate, as judged by the determination of terminal masses of the meteoroids, is below our most pessimistic estimate. This suggests that a basic difference exists between most fireballs and meteorite fireballs. To explain the discrepancy there are two general possibilities: (1) The true influx rate of meteorites is much smaller than suggested by Hawkins, and the majority of fireballs are produced by material that is completely different from that of meteorites (low density, or extremely fragile, or both). (2) Our understanding of the physical processes encountered by a high-speed ablating body, is fundamentally wrong. The average bulk density for the Prairie Network objects, assuming that the photometric mass is equal to the dynamic mass, was computed to be 0.4 g/cm3. A similar value was obtained for the Pribram fireball, but the bulk density of the Pribram meteorites is 3.6 g/cm3." @default.
- W3042874640 created "2020-07-23" @default.
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- W3042874640 date "1968-10-01" @default.
- W3042874640 modified "2023-09-24" @default.
- W3042874640 title "Photographic Networks for Fireballs" @default.
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