Rotationally-Resolved Surface Mineralogy of an Extinct Comet

Details Rotationally-Resolved Surface Mineralogy of an Extinct Comet Rotationally-Resolved Surface Mineralogy of an Extinct Comet

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30241c&link_type=abstract

Spitzer Proposal ID #30241

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Scientific paper

Object 944 Hidalgo is one of the asteroids most likely to be an extinct or dormant comet. Hidalgo's Tisserand invariant (T=2.07) suggests very strongly that this object originated either in the Kuiper belt or in the Oort cloud (Weissman et al. 2002). Our latest ground based results show significant rotational variability in the near-infrared spectrum of Hidalgo, but the ground based spectra are not sufficient to identify the nature of these surface variations. Spitzer observations of Hidalgo would be diagnostic of the surface mineralogy, as has been demonstrated for a number of asteroids (e.g., Emery et al. 2006). We propose to obtain 7.3 to 38 micron IRS spectra of 944 Hidalgo at 8 different rotational phases to characterize its surface composition and other properties such as thermal inertia.

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