The HAT-P-9 system contains 1 exoplanet. It is located 1484.67 light years away from the solar system.
| Mass | 1.28 solar masses |
| Radius | 1.34 solar radiae |
| Temperature | 6350 kelvin |
| Stellar Metallicity | 0.12 decimal exponent |
| Age | 1.6 billion years |
At more than 50 Earth masses, HAT-P-9 b is a gas giant, a planet whose mass is mostly made up of hydrogen and helium, like Jupiter and Saturn.
| Mass | 238.055 Earth masses |
| Density | 0.342 grams per cubic centimeter |
| Radius | 15.614 Earth radiae |
| Semi-major Axis | 0.05287 AU |
| Eccentricity | 0.084 |
| Orbital Period | 3.923 days |
| Discovery Method | Transit |
| Discovery Facility | HATNet |
| Discovery Telescope | Canon 200mm f/1.8L |
| Discovery Instrument | 2K CCD Sensor |
| Discovery Date | 2009-01 |
| Reference | Shporer et al. 2009 |