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T. Mothé-Diniz, J. M. Carvano (Observatoire de Paris/Meudon)
The asteroid 221 Eos (K class), has been traditionally associated to CO/CV meteorites (Bell 1988). This association is based solely on spectral similarities with meteorites, and previously the best spectral analog to Eos was found to be the CO3 Warrenton (Burbine et al. 2001). The 52-color spectrum (http://pdssbn.astro.umd.edu/) and the SMASSIR spectrum (Burbine and Binzel 2001) of 221 Eos in the NIR region, combined with the SMASSII spectrum (Bus and Binzel 2001) in the visible, has now been compared to the whole RELAB meteorites database (http://www.planetary.brown.edu/relab/rel_pub/) updated on July 31, 2003. This comparison revealed a better spectral analog to Eos: the anomalous stone Divnoe, a primitive achondrite meteorite. Problems and implications of such match for the composition of Eos and its dynamical family will be discussed.
This work has been supported by the Conselho Nacional de Desenvolvimento Cient\'{i}fico e Tecnológico - CNPq/Brasil.
References:
Bell, J.F. 1988. A Probable Asteroidal Parent Body for the CV or CO Chondrites. Meteoritics 23, 256.
Burbine, T.H. and Binzel, R.P. Bus, S.J. and Clark, B.E. 2001. K asteroids and CO3/CV3 chondrites. Icarus 36, 245.
Burbine, T.H. and Binzel, R.P. 2002. Small Main-Belt Asteroid Spectroscopic Survey in the Near-Infrared. Icarus 159, 468.
Bus, S.J. and Binzel, R.P. 2002. Phase II of the Small Main-Belt Asteroid Spectroscopic Survey: The Observations. Icarus 158, 106.
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Bulletin of the American Astronomical Society, 36 #4
© 2004. The American Astronomical Soceity.