The Mbale meteorite shower

Details The Mbale meteorite shower The Mbale meteorite shower

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994metic..29..246j&link_type=abstract

Meteoritics (ISSN 0026-1114), vol. 29, no. 2, p. 246-254

Astronomy and Astrophysics

Astrophysics

26

Chondrites, Grain Size, Meteoritic Microstructures, Meteoroid Showers, Orbital Elements, Particle Size Distribution, Radioactive Isotopes, Uganda, Meteorites, Mbale, Stony Meteorites, Ordinary Chondrites, Chondrites, L Chondrites, Description, Strewn Field, Meteorite Fall, Classification, Samples, Meteorite, Radionuclides, Mass, Orbital Elements, Grs, Orbit, Fragmentation, Classification, Microprobe Methods, Spectroscopy, Laboratory Studies

Scientific paper

On 1992 August 14 at 12:40 UTC, an ordinary chondrite of type L5/6 entered the atmosphere over Mbale, Uganda, broke up, and caused a strewn field of size 3 x 7 km. Shortly after the fall, an expedition gathered eye witness accounts and located the position of 48 impacts of masses between 0.19 and 27.4 kg. Short-lived radionuclide data were measured for two specimens, one of which was only 12 days after the fall. Subsequent recoveries of fragements has resulted in a total of 863 mass estimates by 1993 October. The surfaces of all fragments contain fusion crust. The meteorite shower caused some minor inconveniences. Most remarkably, a young boy was hit on the head by a small specimen. The data interpreted as to indicate that the meteorite had an initial mass between 400-1000 kg (most likely approximately 1000 kg) and approached Mbale from AZ = 185 +/- 15, H = 55 +/- 15, and Vinfinity = 13.5 +/- 1.5/s. Orbital elements are given. Fragmentation of the initial mass started probably above 25 km altitude, but the final catastrophic breakup occurred at an altitude of 10-14 km. An estimated 190 +/- 40 kg reached the Earth's surface minutes after the final breakup of which 150 kg of material has been recovered.

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