The HAT-P-51 system contains 1 exoplanet. It is located 1435.38 light years away from the solar system.
| Mass | 0.98 solar masses |
| Radius | 1.04 solar radiae |
| Temperature | 5449 kelvin |
| Stellar Metallicity | 0.27 decimal exponent |
| Age | 8.2 billion years |
At more than 50 Earth masses, HAT-P-51 b is a gas giant, a planet whose mass is mostly made up of hydrogen and helium, like Jupiter and Saturn.
| Mass | 98.209 Earth masses |
| Density | 0.178 grams per cubic centimeter |
| Radius | 14.493 Earth radiae |
| Semi-major Axis | 0.05069 AU |
| Eccentricity | 0.123 |
| Orbital Period | 4.218 days |
| Discovery Method | Transit |
| Discovery Facility | HATNet |
| Discovery Telescope | Multiple Telescopes |
| Discovery Instrument | Multiple Instruments |
| Discovery Date | 2015-12 |
| Reference | Hartman et al. 2015 |