The HAT-P-66 system contains 1 exoplanet. It is located 3051.05 light years away from the solar system.
| Mass | 1.26 solar masses |
| Radius | 1.88 solar radiae |
| Temperature | 6002 kelvin |
| Stellar Metallicity | 0.035 decimal exponent |
| Age | 4.66 billion years |
At more than 50 Earth masses, HAT-P-66 b is a gas giant, a planet whose mass is mostly made up of hydrogen and helium, like Jupiter and Saturn.
| Mass | 248.861 Earth masses |
| Density | 0.242 grams per cubic centimeter |
| Radius | 17.822 Earth radiae |
| Semi-major Axis | 0.04363 AU |
| Eccentricity | 0.09 |
| Orbital Period | 2.972 days |
| Discovery Method | Transit |
| Discovery Facility | HATNet |
| Discovery Telescope | Canon 200mm f/1.8L |
| Discovery Instrument | 2K CCD Sensor |
| Discovery Date | 2016-12 |
| Reference | Hartman et al. 2016 |