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We present photometry of the G0 star HAT-P-1 during six transits of its closein giant planet, and we refine the estimates of the system parameters. Relative to Jupiter’s properties, HAT-P-1b is 1.20 ±0.05 times larger and its surface gravity is 2.7 ±0.2 times weaker. Although it remains the case that HAT-P-1b is among the least dense of the known sample of transiting exoplanets, its properties are in accord with previously published models of strongly irradiated, coreless, solarcomposition giant planets. The times of the transits have a typical accuracy of 1 min and do not depart significantly from a constant period. Subject headings: planetary systems — stars: individual (HAT-P-1, ADS 16402B) 1.
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