Initial Results of the Cornell Mid-IR Asteroid Spectroscopy Survey

Details Initial Results of the Cornell Mid-IR Asteroid Spectroscopy Survey Initial Results of the Cornell Mid-IR Asteroid Spectroscopy Survey

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001dps....33.4121l&link_type=abstract

American Astronomical Society, DPS Meeting #33, #41.21; Bulletin of the American Astronomical Society, Vol. 33, p.1119

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Scientific paper

Silicate minerals, which form the major constituents of asteroid surfaces, exhibit important diagnostic emissivity features in the thermal infrared. Some of these minerals, such as plagioclase and coarse-grained iron oxides, cannot be detected unambiguously using visible to near-IR spectroscopy. Mid-IR spectra, therefore, may provide additional diagnostic information that is needed to resolve ambiguities in the current asteroid classification scheme, which is based on visible to near-IR measurements. Published spectra by Dotto et al. (A & A 358,2000) of the small number of asteroids studied by ISO appear to validate this claim. We report the initial results of the Cornell Mid-IR Asteroid Spectroscopy (MIDAS) survey. MIDAS covers the 8-14 micron wavelength region and is conducted at Palomar Observatory using the Spectrocam-10 (SC-10) spectrograph on the 200-inch Hale telescope. We have conducted two short observing runs to date, on 09 October 2000 and 09 April 2001 and have obtained mid-IR spectra of the S-type asteroid 3 Juno and the C-type asteroid 145 Adeona. Although these spectra were obtained under non-photometric conditions, they validate our estimates of the signal to noise ratios that could be expected from a variety of main belt and near-Earth objects using SC-10. Further observations are planned for October 1-2, 2001. Targets include 4 Vesta (V-class), 11 Parthenope (S-class), 22 Kalliope (M-class), 54 Arethusa (C-class) and others. We hope to sample the spectra of a statistically significant number of asteroids from a wide variety of the current visible to near-IR spectral classes.

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