| Titre | The St-Robert Bolide of June 14, 1994 |
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| Auteur | 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 |
| Liens | Online - En ligne
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| Image |  |
| Année | 1997 |
| Séries alt. | Commission géologique du Canada, Contributions aux publications extérieures 1996390 |
| Éditeur | Royal Astronomical Society of Canada |
| Réunion | Meteorite and Impacts Advisory Committee/Comté Consultatif sur les Météorities et les Impacts to the Canadian Space Agency; Saint Hubert,; CA; Octobre 1995 |
| Document | publication en série |
| Lang. | anglais |
| Media | papier; en ligne; numérique |
| Formats | pdf |
| Province | Québec |
| SNRC | 31H/14; 31H/15 |
| Région | St-Robert; St-Aimé; Richelieu River; Yamaska River; Montréal; Saint-Guillaune-D'Upton; Verchères |
| Lat/Long OENS | -73.5000 -72.5000 46.0000 45.7500 |
| Sujets | météorites; cratères météoriques; ondes sismiques; puits; déterminations de la masse volumique en vrac; modèles; radioactivité; géologie extraterrestre; géophysique; géologie des dépôts
meubles/géomorphologie |
| Illustrations | photographies; photographies aériennes; tableaux; graphiques |
| Diffusé | 1997 01 01 |
| Résumé | (disponible en anglais seulement)
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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