Description
We report the discovery of HAT-P-25b, a transiting extrasolar planet orbiting the V=13.19 G5 dwarf star GSC 1788-01237, with a period P=3.652836+/-0.000019days, transit epoch T_c_=2455176.85173+/-0.00047 (BJD - barycentric Julian dates throughout the paper are calculated from Coordinated Universal Time, UTC), and transit duration 0.1174+/-0.0017 days. The host star has a mass of 1.01+/-0.03M_{sun}_, radius of 0.96^+0.05^_-0.04_R_{sun}_, effective temperature 5500+/-80K, and metallicity [Fe/H]=+0.31+/-0.08. The planetary companion has a mass of 0.567+/-0.022 M_J_ and radius of 1.190^+0.081^_-0.056_R_J_ yielding a mean density of 0.42+/-0.07g/cm3.
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