Other
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.3307c&link_type=abstract
American Astronomical Society, DPS meeting #39, #33.07; Bulletin of the American Astronomical Society, Vol. 39, p.477
Other
Scientific paper
We have observed 16 K and Xk-type asteroids (from the Bus taxonomy) and we present an analysis of their spectral properties from 0.4 to 2.5 microns. Our results indicate that K and Xk asteroids are distinct from other main belt asteroid types (S, B, C, F, and G). They do not appear to be a subset of these other types, however they are most similar to G and C-types. K and Xk asteroids have a wider range of 1-micron band center positions (0.85 - 1.12 microns) than S-type asteroids (0.90-1.10 microns), possibly reflecting a greater range in pyroxene-olivine compositions. K and Xk asteroids nearly span the range of band center positions exhibited by the carbonaceous chondrites (CO, CM, CV, CH, CK, CR, and CI), whereas B, C, and F-type asteroids show band centers longer than any of the chondrites measured here. This could indicate that K and Xk-types are better spectral analogues for the majority of our carbonaceous meteorites than the traditional B, C, and F-matches suggested in the literature. Although our analysis uses only 4 parameters, we tentatively suggest that K asteroids tend to have longer wavelength bands and are most consistent with CO, CK, CV, and possibly CM meteorites. Xk asteroids, however, can have long or short wavelength bands and are consistent with any of the carbonaceous meteorites measured here. If K asteroids are composed of carbonaceous chondrite meteorite material, then something is happening at the surfaces of the asteroids to vary (redden) the continuum slope from 1.1 to 1.6 microns. This paper is a preliminary part of our ongoing survey to determine K-type mineralogy, meteorite linkages, and significance to the geology of the asteroid regions. This is the first focused study of non-Eos K-type asteroids.
Clark Beth Ellen
Ockert-Bell Maureen
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