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We report the discovery of a Jupiter-size planet transiting a relativelybright (V = 11.56) and metal-rich early K dwarf star with a period of about 2.9days. On the basis of follow-up photometry and spectroscopy we determine themass and radius of the planet, HAT-P-3b, to be M_p = 0.599 +/- 0.026 M_Jup andR_p = 0.890 +/- 0.046 R_Jup. The relatively small size of the object for itsmass implies the presence of about 75 Earth masses worth of heavy elements (1/3of the total mass) based on current theories of irradiated extrasolar giantplanets, similar to the mass of the core inferred for the transiting planet HD149026b. The bulk density of HAT-P-3b is found to be rho_p = 1.06 +/- 0.17g/cm^3, and the planet orbits the star at a distance of 0.03894 AU. Ephemeridesfor the transit centers are T_c = 2,454,218.7594 +/- 0.0029 + N (2.899703 +/-0.000054) (HJD).

HAT-P-3b: A heavy-element rich planet transiting a K dwarf star