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TitleThe St-Robert Bolide of June 14, 1994
AuthorHildebrand, A R; Brown, P G; Wacker, J F; Wetmiller, R J; Pagé, D; Green, D W E; Jacobs, C F; ReVelle, D O; Tagliaferri, E; Kissin, S A
SourceJournal of the Royal Astronomical Society of Canada vol. 91, no. 6, 1997 p. 261-275
LinksOnline - En ligne
Alt SeriesGeological Survey of Canada, Contribution Series 1996390
PublisherRoyal Astronomical Society of Canada
MeetingMeteorite and Impacts Advisory Committee/Comté Consultatif sur les Météorities et les Impacts to the Canadian Space Agency; Saint Hubert,; CA; October 1995
Mediapaper; on-line; digital
File formatpdf
NTS31H/14; 31H/15
AreaSt-Robert; St-Aimé; Richelieu River; Yamaska River; Montreal; Saint-Guillaune-D'Upton; Verchères
Lat/Long WENS -73.5000 -72.5000 46.0000 45.7500
Subjectsextraterrestrial geology; geophysics; surficial geology/geomorphology; meteorites; meteorite craters; seismic waves; pits; bulk density determinations; models; radioactivity
Illustrationsphotographs; aerial photographs; tables; plots
Released1997 01 01
AbstractThe fall of the two tonne St-Robert bolide was widely seen and heard by witnesses on the ground and satellite systems in Earth orbit. The St-Robert fireball can be classified as ablation group I with a single fragmentation (IF) and strength group "d" (disruption at -9 × 10 5 Pa) according to the system of Ceplecha et al. (1993). Its terminal disruption was characteristic of fireballs ofthat group and low entry velocity (< 15 km s -1). The fragmentation event yielded an estimated 200 meteorites with masses in excess of 0.055 kg that fell in a strewn field measuring 8 km × 3.5 km. Plunge pits formed in the clay-rich soils of the region have depths proportional to the momenta per cross sectional area of the falling meteorites. Cosmogenic radionuclide results suggest that the meteoroid had a single stage exposure history and was significantly nonspherical. A tentative detection of the bolide by a seismograph allows provisional calibration of seismic observations of bolides using the satellite-derived energy and mass estimates. The value of the satellite and seismograph observations of the St-Robert fireball is enhanced because the bolide was typical of slow fireballs and was caused by the most common type of meteorite to fall (H5 chondrite).

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