Characterization of Asteroid 2867 Steins, a Target of the Rosetta Mission

Details Characterization of Asteroid 2867 Steins, a Target of the Rosetta Mission Characterization of Asteroid 2867 Steins, a Target of the Rosetta Mission

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop40259l&link_type=abstract

Spitzer Proposal ID #40259

Mathematics

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Scientific paper

We propose to re-observe asteroids 2867 Steins, one of the target of the Rosetta mission in order to definitevely ascertain its taxonomic classification and its surface composition. Our previous SST observations performed during cycle 2 had to assume a much bigger size than presently established, and our spectra do not have a good enough signal-over-noise ratio to clearly distinguish the exact position of the different bands. The proposed SST observations consist in taking low resolution spectra with the IRS instrument over its full wavelength range 5-38 micron so as to reach a signal-over-noise ratio larger than 200 in the 7-20 micron spectral range which is of prime interest for identification of the mineralogical features. Five individual spectra will be obtained for a total observing time of 1.4 hr. The expected results will allow identifying the mineralogical signatures so as to determine the taxonomic classification, the surface composition and possible weathering processes.

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