Spectroscopy of Almahata Sitta and Goalpara Meteorites: Implications for Ureilite Composition and Association with Asteroids

Details Spectroscopy of Almahata Sitta and Goalpara Meteorites: Implications for Ureilite Composition and Association with Asteroids Spectroscopy of Almahata Sitta and Goalpara Meteorites: Implications for Ureilite Composition and Association with Asteroids

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.1330b&link_type=abstract

American Astronomical Society, DPS meeting #42, #13.30; Bulletin of the American Astronomical Society, Vol. 42, p.1059

Astronomy and Astrophysics

Astronomy

Scientific paper

Reflectance spectra have been acquired for several fresh surfaces of Almahata Sitta meteorites (1) and one Goalpara meteorite in order to characterize the spectral properties of these ureilites. These data are compared to recently acquired reflectance spectra of a larger collection of fresh and weathered ureilites (2).
Ureilites are characterized by low reflectance in the VNIR range and weak absorptions near 0.3, 1 and 2 µm (1,3). The latter two features are attributed to pyroxene and olivine and the low reflectance is a result of opaques including fine-grained carbon and metals. Linear mixtures of the spectra of several Almahata Sitta meteorites are consistent with the spectral character of 2008 TC3 (1).
VNIR reflectance spectra of fresh and external surfaces of the Goalpara meteorite exhibit a slope characteristic of thin silica coatings on basalt (4); however, mid-IR spectra are characterized by olivine and pyroxene features and only show evidence of the silica coating on the external surface.
The reflectance properties from 0.28-2.5 µm of ureilites share some similarities with those observed for F-, B- and S-type asteroids. We are investigating these in order to provide constraints on the origin of ureilites. We hope to apply the mid-IR spectral studies of the Almahata Sitta and Goalpara meteorite surfaces to mid-IR transmittance spectra of ureilites (5) and to the mid-IR Spitzer data of F-, B- and S-type asteroids to contribute towards our understanding of possible ureilite parent bodies as well.
We thank the Natural History Museum in Vienna for generously loaning us the Goalpara meteorite.
References:
1. Hiroi, T., et al. 2010. MAPS. in press.
2. Cloutis, E. A., et al. 2010. MAPS. in press.
3. Jenniskens, P., et al. 2009. Nature. 458, 485-488.
4. Minitti, M. E., et al. 2007. JGR. 112, E05015 1-24.
5. Sandford, S. A., 1993. Meteoritics. 28, 579-585.

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