The HAT-P-3 system contains 1 exoplanet. It is located 438.86 light years away from the solar system.
| Mass | 1.06 solar masses |
| Radius | 0.87 solar radiae |
| Temperature | 5185 kelvin |
| Stellar Metallicity | 0.27 decimal exponent |
| Age | 1.6 billion years |
At more than 50 Earth masses, HAT-P-3 b is a gas giant, a planet whose mass is mostly made up of hydrogen and helium, like Jupiter and Saturn.
| Mass | 206.589 Earth masses |
| Density | 0.855 grams per cubic centimeter |
| Radius | 10.536 Earth radiae |
| Semi-major Axis | 0.03866 AU |
| Eccentricity | 0 |
| Orbital Period | 2.900 days |
| Discovery Method | Transit |
| Discovery Facility | HATNet |
| Discovery Telescope | Canon 200mm f/1.8L |
| Discovery Instrument | 2K CCD Sensor |
| Discovery Date | 2007-09 |
| Reference | Torres et al. 2007 |