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Ejby—A new H5/6 ordinary chondrite fall in Copenhagen, Denmark

Haack, H; Sorensen, A. N.; Bischoff, A.; Patzek, M; Barrat, J-M.; Midtskogen, S.; Stempels, E.; Laubenstein, M.; Greenwood, R.; Schmitt-Kopplin, P.; Busemann, H.; Maden, C.; Bauer, K.; Morino, P.; Schonbachler, M.; Voss, P. and Dahl-Jensen, T. (2019). Ejby—A new H5/6 ordinary chondrite fall in Copenhagen, Denmark. Meteoritics and Planetary Science (Early Access).

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On February 6, 2016 at 21:07:19 UT, a very bright fireball was seen over the eastern part of Denmark. The weather was cloudy over eastern Denmark, but many people saw the sky light up—even in the heavily illuminated Copenhagen. Two hundred and thirty three reports of the associated sound and light phenomena were received by the Danish fireball network. We have formed a consortium to describe the meteorite and the circumstances of the fall and the results are presented in this paper. The first fragment of the meteorite was found the day after the fall, and in the following weeks, a total of 11 fragments with a total weight of 8982 g were found. The meteorite is an unbrecciated, weakly shocked (S2), ordinary H chondrite of petrologic type 5/6 (Bouvier et al. 2017). The concentration of the cosmogenic radionuclides suggests that the preatmospheric radius was rather small ~20 cm. The cosmic ray exposure age of Ejby (83 ± 11 Ma) is the highest of an H chondrite and the second highest age for an ordinary chondrite. Using the preatmospheric orbit of the Ejby meteoroid (Spurny et al. 2017) locations of the recovered fragments, and wind data from the date of the fall, we have modeled the dark flight (below 18 km) of the fragments. The recovery location of the largest fragment can only be explained if aerodynamic effects during the dark flight phase are included. The recovery location of all other fragments are consistent with the dark flight modeling.

Item Type: Journal Item
Copyright Holders: 2019 The Meteoritical Society
ISSN: 1086-9379
Project Funding Details:
Funded Project NameProject IDFunding Body
Consolidated Grant - Solar Studies and Planetary Studies (SS & PL 2016)ST/P000657/1STFC (Science & Technology Facilities Council)
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 62371
Depositing User: Richard Greenwood
Date Deposited: 09 Jul 2019 14:00
Last Modified: 19 Jul 2019 08:05
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