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 ± 0.000025 days. From the transit light curve we determine that the radius of the planet is Rp = 1.257 ± 0.053 RJ. HAT-P-5b has a mass of Mp = 1.06 ± 0.11 MJ, similar to the average mass of previously known transiting exoplanets, and a density of ρp = 0.66 ± 0.11 g cm −3. We find that the center of transit is Tc = 2,454,241.77663 ± 0.00022 days (HJD), and the total transit duration is 0.1217 ± 0.0012 days.

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