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We report the discovery of a massive (Mp = 9.04+/-0.50 MJup) planettransiting the bright (V = 8.7) F8 star HD 147506, with an orbital period of5.63341+/-0.00013 days and an eccentricity of e = 0.520+/-0.010. From thetransit light curve we determine that the radius of the planet is Rp =0.982^{+0.038}_{0.105}RJup. HD 147506b (also coined HAT-P-2b) has a mass about9 times the average mass of previously-known transiting exoplanets, and adensity of rho = 11.9 g cm-3, greater than that of rocky planets like theEarth. Its mass and radius are marginally consistent with theories of structureof massive giant planets composed of pure H and He, and may require a large(~100 Earth mass) core to account for. The high eccentricity causes a 9-foldvariation of insolation of the planet between peri- and apastron. Usingfollow-up photometry, we find that the center of transit is Tmid =2,454,212.8559 +/- 0.0007 (HJD), and the transit duration is 0.177 +/-0.002 d.

HD147506b: A Super-Massive Planet in an Eccentric Orbit Transiting a Bright Star