Asteroid 2008 TC <sub>3</sub> , not a polymict ureilitic but a polymict C1 chondrite parent body? Survey of 249 Almahata Sitta fragments
نویسندگان
چکیده
On October 7, 2008, the asteroid 2008 TC3 exploded as it entered Earth’s atmosphere, producing significant dust (in atmosphere) and delivering thousands of stones in a strewn field Sudan, collectively known Almahata Sitta (AhS) stones. About 600 fragments were officially recovered 2009. Further rocks collected since fall event by local people. From these stones, 249 classified at Institut für Planetologie Münster (MS) MS-xxx or MS-MU-xxx AhS subsamples. Most are ureilitic origin (168; 67%): 87 coarse-grained ureilites, 60 fine-grained 15 ureilites with variable texture/mineralogy, four trachyandesites, two polymict breccias. We identified 81 non-ureilitic fragments, corresponding to 33% samples studied Münster. These included chondrites, namely 65 enstatite chondrites (43 EL; 22 EH), 11 ordinary (OC), one carbonaceous chondrite, unique R-like chondrite. Furthermore, three represent type achondrite. Since all must be regarded individual specimens independent from each other, number fresh ureilite chondrite falls our meteorite collections has been increased several hundred percent. Overall, weigh between <1 250 g have mean mass ~15 g. If we consider—almost years after fall—the calculations, observations during mineralogy C1 91A 671, experimental work on fitting spectrum (e.g., Goodrich et al., 2019; Jenniskens 2010; Shaddad 2010), main portion meteoroid was likely made (carbonaceous) mostly lost atmosphere. In particular, fact that materials found important implications for interpreting TC3's early spectroscopic results. al. (2019) correctly suggested if scientists had not “water-free” enstatites, OC) field, would assumed meteoroid. Considering dominating exploding consisted materials, cannot ureilite; consequently, state breccia, specifically object may formed late accretion least 50–100 Ma calcium–aluminum-rich inclusions.
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ژورنال
عنوان ژورنال: Meteoritics & Planetary Science
سال: 2022
ISSN: ['1945-5100', '1086-9379']
DOI: https://doi.org/10.1111/maps.13821