| Title | The St-Robert Bolide of June 14, 1994 |
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| Author | Hildebrand, 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 |
| Source | Journal of the Royal Astronomical Society of Canada vol. 91, no. 6, 1997 p. 261-275 |
| Links | Online - En ligne
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| Image |  |
| Year | 1997 |
| Alt Series | Geological Survey of Canada, Contribution Series 1996390 |
| Publisher | Royal Astronomical Society of Canada |
| Meeting | Meteorite and Impacts Advisory Committee/Comté Consultatif sur les Météorities et les Impacts to the Canadian Space Agency; Saint Hubert,; CA; October 1995 |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf |
| Province | Quebec |
| NTS | 31H/14; 31H/15 |
| Area | St-Robert; St-Aimé; Richelieu River; Yamaska River; Montreal; Saint-Guillaune-D'Upton; Verchères |
| Lat/Long WENS | -73.5000 -72.5000 46.0000 45.7500 |
| Subjects | extraterrestrial geology; geophysics; surficial geology/geomorphology; meteorites; meteorite craters; seismic waves; pits; bulk density determinations; models; radioactivity |
| Illustrations | photographs; aerial photographs; tables; plots |
| Abstract | The 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). |
| GEOSCAN ID | 208277 |
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