Surface temperature of the nucleus of Comet 9P/Tempel 1

By O. Groussin, M. A’Hearn, Jian-Yang Li, P. Thomas, J. Sunshine, C. Lisse, K. Meech, T. Farnham, L. Feaga, W. Delamere. 2007

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A ballistics analysis of the Deep Impact ejecta plume: Determining Comet Tempel 1's gravity, mass, and density (2007, background): “…of the fragment surface by incident sunlight, coupled with the very low thermal inertia of the cometary fragment material (Lisse et al., 2005; Groussin et al., 2007), so that the out-gassing occurs at local noon on the fragment, and the body is accelerated by jet reaction forces in the…”
Directional characteristics of thermal–infrared beaming from atmosphereless planetary surfaces – a new thermophysical model (2011, methodology): “Groussin et al. (2007) produced a smooth-surface model including the detailed 3D shape of the nucleus of Comet 9P/Tempel 1 to interpret spatially resolved thermal–infrared observations conducted by the Deep Impact spacecraft, and Davidsson, Gutiérrez & Rickman (2009) attempted to improve upon this…”
The Lifetime of Ice on Main Belt Asteroids (2008, background): “The thermal inertia derived from temperature maps of comet 9P/Tempel 1, the most direct measurement available, is less than 50 J m 2 K 1 s 1/2 (Groussin et al. 2007).”