Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009dps....41.6818m&link_type=abstract
American Astronomical Society, DPS meeting #41, #68.18
Astronomy and Astrophysics
Astronomy
Scientific paper
The mid-infrared spectra (4000-500 cm-1, i.e., 2.5-20 μm) of 27 stones from the Almahata Sitta meteorite fall are presented. Almahata Sitta has been classified as an anomalous polymict ureilite based on the extensive initial studies of one meteorite [1]. Some 300 meteorites were collected, with very diverse textures. Samples from 27 stones were prepared as standard KBr pellets with a 1:100 ratio of meteorite to KBr; typical meteorite samples were 1-3 mg. Spectral profiles are dominated by a 10 μm SiO adsorption feature indicative of pyroxenes and olivines. These data are largely consistent with previous measurements of ureilites at these wavelengths [2]. The ratio of olivine to pyroxene varies from one stone to the next, and even between multiple samples of the same stone in some instances. The spectra presented help assertain the level of diversity in Almahata Sitta, help identify samples that are interesting for further study, and help understand the bulk composition of the parent asteroid 2008 TC3.
References: [1] Jenniskens et al. (2009) Nature 458, 485-488; [2] Sandford, S.A. (1993) Meteoritics 28, 579-585.
Jenniskens Petrus M. M.
Milam Stefanie N.
Nuevo Michel
Sandford Scott A.
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