Other
Scientific paper
Sep 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.7109m&link_type=abstract
American Astronomical Society, DPS meeting #38, #71.09; Bulletin of the American Astronomical Society, Vol. 38, p.627
Other
Scientific paper
The Eos family is one of the largest asteroid families in the outer mainbelt.
In the visible range, the spectra of its members show considerable diversity, suggesting that the parent body of the family might have experienced a at some thermal metamorphism or even partial differentiation.
Through comparisons with meteorite spectra, the asteroid 221 Eos have been associated with CO3/CV3 carbonaceous chondrites by Bell (1988) and later by Burbine et al (2001). Recently however, MothéDiniz and Carvano (2004) found that the best for the VNIR spectra of Eos in an extended meteorite spectral database is the anomalous stone Divinoe. In order to investigate the true mineralogy of this family, the spectra in the 0.8-2.5 micron range of 22 family members were obtained using SpeX at IRTF, and analyzed through different techniques. In this range the spectra of the family members show a much lower diversity than what is seen in their visible spectra, all being characterized by the presence of a broad absorption feature around 1 micron and by a weaker to absent feature at 2 microns, which suggests the presence of olivine with a minor pyroxene component. The analyzes were performed using: (1) comparison with meteorites; (2) modified gaussian model fitting; and (3) modeling of reflectance spectra of mixtures of minerals. The comparison with meteorites did not give good matches for the spectra of the Eos family members. The two other techniques, however, allowed us to infer a differentiated mineralogy for the family, and presented a good agreement. The detailed results of the analysis performed will be presented.
Burbine Thomas
Bus Schelte
Carvano Jorge
Duffard René
Mothé-Diniz Thais
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