HAT-P-5b: A Jupiter-like Hot Jupiter Transiting a Bright Star

We report the discovery of a planet transiting a moderately bright (V = 12.00) G star, with an orbital period of 2.788491 plus or minus 0.000025 days. From the transit light curve we determine that the radius of the planet is R sub(P) = 1.257 plus or minus 0.053 R sub(J). HAT-P-5b has a mass of M sub(P) = 1.06 plus or minus 0.11 M sub(J), similar to the average mass of previously known transiting exoplanets, and a density of [unk] = 0.66 plus or minus 0.11 g cm super(-3). We find that the center of transit is [unk] = 2.454, 241.77663 plus or minus 0.00022 days (HJD), and the total transit duration is 0.1217 plus or minus 0.0012 days.