Interpretation Of Spitzer Observations Of Comet 9P/Tempel 1 Using Deep Impact In-situ Measurements.

Details Interpretation Of Spitzer Observations Of Comet 9P/Tempel 1 Using Deep Impact In-situ Measurements. Interpretation Of Spitzer Observations Of Comet 9P/Tempel 1 Using Deep Impact In-situ Measurements.

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.2807g&link_type=abstract

American Astronomical Society, DPS meeting #38, #28.07; Bulletin of the American Astronomical Society, Vol. 38, p.1297

Astronomy and Astrophysics

Astronomy

Scientific paper

The determination of the size and shape of a comet nucleus from remote observations is challenging due to uncertainties in the thermal properties of the nucleus, the pole ortientation, the rotation period, and possible contamination of the nucleus signal by dust coma. As a result of the Deep Impact mission, we have been
able to determine for the first time all the above parameters for a comet, 9P/Tempel 1, from in-situ observations. From Deep Impact we have obtained an accurate 3D shape model for the nucleus with 32,000 plates, the pole orientation (RA = 294 deg, Dec = 73 deg), the rotation period (P = 40.7 hours), the surface temperature distribution of the nucleus, and its thermal properties. We have used the above constraints to generate a real infrared light curve of the nucleus and to confront it with Spitzer light curve observations taken on 2004 March 25-27, with the comet at rh = 3.7 AU. We present here how we generate the synthetic infrared light curve of the nucleus of comet 9P/Tempel 1, how it compares with the Spitzer observations, and the consequences for future infrared observations of cometary nuclei.

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