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We present Spitzer 8 micron transit observations of the extrasolar planetsystem HD 149026. At this wavelength, transit light curves are weakly affectedby stellar limb-darkening, allowing for a simpler and more accuratedetermination of planetary parameters. We measure a planet-star radius ratio ofR_p/R_s = 0.05158 +/- 0.00077, and in combination with ground-based data andindependent constraints on the stellar mass and radius, we derive an orbitalinclination of i = 85.4 +0.9/-0.8 deg. and a planet radius of 0.755 +/- 0.040Jupiter radii. These measurements further support models in which the planet isgreatly enriched in heavy elements.

A Precise Estimate of the Radius of HD 149026b