 Orbiting the star is HAT-P-2b, which was at the time of its discovery the most massive transiting extrasolar planet.At almost 9 times the mass of Jupiter and an estimated surface temperature of ~900 kelvins, on a 5.6 day orbit, this planet is unlike any previously discovered transiting planet.The planet has a large mass (nine times the mass of Jupiter), and a surface gravity 25 times that exerted by the Earth.