Spectroscopy of near-Earth asteroids

René Michelsen, Andreas Nathues, Claes-Ingvar Lagerkvist

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

We present spectra and taxonomic classifications of 12 Near-Earth Asteroids (NEAs) and 2 inner Main Belt asteroids. The observations were carried out with the ESO 3.5 m NTT and the Danish 1.54 m telescope at La Silla, Chile. Eleven of the investigated NEAs belong to the S class while only one C-type has been identified. Two NEAs were observed at phase angles larger than 60 degrees introducing significant phase reddening. In order to allow for comparisons between spectra of asteroids observed at different phase angles we make attempts to correct for this effect. However, it turned out that a uniform approach based on previous measurements of phase reddening by means of observational data is not reasonable. For the NEAs we question the approach of taxonomic classification in terms of subgroups, when the classification is based on spectra obtained at large phase angles.
Original languageEnglish
JournalAstronomy & Astrophysics
Volume451
Issue number1
Pages (from-to)331-337
ISSN0004-6361
DOIs
Publication statusPublished - 2006

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