The HAT-P-31 system contains 1 exoplanet. It is located 1122.14 light years away from the solar system.
| Mass | 1.31 solar masses |
| Radius | 1.39 solar radiae |
| Temperature | 6065 kelvin |
| Stellar Metallicity | 0.15 decimal exponent |
| Age | 3.17 billion years |
At more than 50 Earth masses, HAT-P-31 b is a gas giant, a planet whose mass is mostly made up of hydrogen and helium, like Jupiter and Saturn.
| Mass | 721.474 Earth masses |
| Density | 2.180 grams per cubic centimeter |
| Radius | 12.218 Earth radiae |
| Semi-major Axis | 0.061 AU |
| Eccentricity | 0.25 |
| Orbital Period | 5.005 days |
| Discovery Method | Transit |
| Discovery Facility | HATNet |
| Discovery Telescope | Canon 200mm f/1.8L |
| Discovery Instrument | 2K CCD Sensor |
| Discovery Date | 2011-09 |
| Reference | Kipping et al. 2011 |