Abstract:
:In the absence of a firm link between individual meteorites and their asteroidal parent bodies, asteroids are typically characterized only by their light reflection properties, and grouped accordingly into classes. On 6 October 2008, a small asteroid was discovered with a flat reflectance spectrum in the 554-995 nm wavelength range, and designated 2008 TC(3) (refs 4-6). It subsequently hit the Earth. Because it exploded at 37 km altitude, no macroscopic fragments were expected to survive. Here we report that a dedicated search along the approach trajectory recovered 47 meteorites, fragments of a single body named Almahata Sitta, with a total mass of 3.95 kg. Analysis of one of these meteorites shows it to be an achondrite, a polymict ureilite, anomalous in its class: ultra-fine-grained and porous, with large carbonaceous grains. The combined asteroid and meteorite reflectance spectra identify the asteroid as F class, now firmly linked to dark carbon-rich anomalous ureilites, a material so fragile it was not previously represented in meteorite collections.
journal_name
Naturejournal_title
Natureauthors
Jenniskens P,Shaddad MH,Numan D,Elsir S,Kudoda AM,Zolensky ME,Le L,Robinson GA,Friedrich JM,Rumble D,Steele A,Chesley SR,Fitzsimmons A,Duddy S,Hsieh HH,Ramsay G,Brown PG,Edwards WN,Tagliaferri E,Boslough MB,Spaldidoi
10.1038/nature07920subject
Has Abstractpub_date
2009-03-26 00:00:00pages
485-8issue
7237eissn
0028-0836issn
1476-4687pii
nature07920journal_volume
458pub_type
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