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We report on the latest discovery of the HATNet project; a very hot giantplanet orbiting a bright (V = 10.5) star with a small semi-major axis of a =0.0377 +/- 0.0005 AU. Ephemeris for the system is P = 2.2047299 +/- 0.40days, mid-transit time E = 2,453,790.2593 +/- 0.0010 (BJD). Based on theavailable spectroscopic data on the host star and photometry of the system, theplanet has a mass of Mp = 1.78+/-^{0.08}_{0.05} MJup and radius of Rp =1.36+/-^{0.20}_{0.09} RJup. The parent star is a slightly evolved F6 star withM = 1.47+/-^{0.08}_{-0.05} Msun,R = 1.84+/-^{0.23}_{0.11} Rsun, Teff = 6350 +/-80 K, and metallicity [Fe/H] = +0.26 +/- 0.08. The relatively hot and largehost star, combined with the close orbit of the planet, yield a very highplanetary irradiance of (4.71+/-^{1.44}_{0.05}) 10^9 erg cm^{-2}s^{-1}, whichplaces the planet near the top of the pM class of irradiated planets as definedby Fortney et al. (2007). If as predicted by Fortney et al. (2007) the planetre-radiates its absorbed energy before distributing it to the night side, theday-side temperature should be about (2730+/-^{150}_{100}) K. Because the hoststar is quite bright, measurement of the secondary eclipse should be feasiblefor ground-based telescopes, providing a good opportunity to compare thepredictions of current hot Jupiter atmospheric models with the observations.Moreover, the host star falls in the field of the upcoming Kepler mission;hence extensive space-borne follow-up, including not only primary transit andsecondary eclipse observations but also asteroseismology, will be possible.

HAT-P-7b: An Extremely Hot Massive Planet Transiting a Bright Star in the Kepler Field