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Context. Near-Earth asteroid-comet transition object 107P/ (4015)Wilson-Harrington is a possible target of the joint European Space Agency (ESA)and Japanese Aerospace Exploration Agency (JAXA) Marco Polo sample returnmission. Physical studies of this object are relevant to this mission, and alsoto understanding its asteroidal or cometary nature. Aims. Our aim is to obtainsignificant new constraints on the surface thermal properties of this object.Methods. We present mid-infrared photometry in two filters (16 and 22 microns)obtained with NASA's Spitzer Space Telescope on February 12, 2007, and resultsfrom the application of the Near Earth Asteroid Thermal Model (NEATM).Weobtained high S/N in two mid-IR bands allowing accurate measurements of itsthermal emission. Results. We obtain a well constrained beaming parameter (eta= 1.39 +/- 0.26) and obtain a diameter and geometric albedo of D = 3.46 +/-0.32 km, and pV = 0.059 +/- 0.011. We also obtain similar results when we applythis best-fitting thermal model to single-band mid-IR photometry reported byCampins et al. (1995), Kraemer et al. (2005) and Reach et al. (2007).Conclusions. The albedo of 4015 Wilson-Harrington is low, consistent with thoseof comet nuclei and primitive C-, P-, D-type asteorids. We establish a roughlower limit for the thermal inertia of W-H of 60 Jm^-2s^(-0.5)K^-1 when it isat r=1AU, which is slightly over the limit of 30 Jm^-2s^(-0.5)K-1 derived byGroussin et al. (2009) for the thermal inertia of the nucleus of comet22P/Kopff.

Spitzer observations of the asteroid-comet transition object and potential spacecraft target 107P (4015) Wilson-Harrington