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Thermal Inertia and Surface Roughness of Comet 9P/Tempel 1 Derived from Recalibrated Deep Impact NIR Spectroscopy
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Astrophysics.
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2011 (English)In: EPSC-DPS Joint Meeting 2011, 2011, 221- p.Conference paper (Refereed)
Abstract [en]

On July 4, 2005, the HRI-IR instrument onboard the Deep Impact spacecraft (NASA/Univ. of Maryland) acquired the first ever near-infrared spectra of a fully resolved comet nucleus, 9P/Tempel 1. Early attempts to estimate the thermal inertia of the surface material were inconclusive, due to negligence of small-scale surface roughness in the thermophysical models used to analyze the spectra. Following a substantial recalibration of the original dataset, we now reconsider the 9P/Tempel 1 spectra, using more realistic thermophysical models. In addition to largescale nucleus irregularity, these models now explicitly consider small-scale roughness and related phenomena such as shadowing and IR self heating. Furthermore, 3D heat conduction can be utilized when topographic features are similar in size to the thermal skin depth, or smaller. Estimates of the thermal inertia, degree of small-scale roughness and their levels of variation across the nucleus are presented.

Place, publisher, year, edition, pages
2011. 221- p.
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:uu:diva-170165OAI: oai:DiVA.org:uu-170165DiVA: diva2:508582
EPSC-DPS Joint Meeting 2011
Available from: 2012-03-09 Created: 2012-03-09 Last updated: 2012-10-11

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