The HAT-P-17 system contains 2 exoplanets. It is located 301.31 light years away from the solar system.
| Mass | 0.99 solar masses |
| Radius | 0.87 solar radiae |
| Temperature | 5246 kelvin |
| Stellar Metallicity | 0 decimal exponent |
| Age | 7.8 billion years |
At more than 50 Earth masses, HAT-P-17 b is a gas giant, a planet whose mass is mostly made up of hydrogen and helium, like Jupiter and Saturn.
| Mass | 184.341 Earth masses |
| Density | 0.640 grams per cubic centimeter |
| Radius | 11.769 Earth radiae |
| Semi-major Axis | 0.0882 AU |
| Eccentricity | 0.35 |
| Orbital Period | 10.339 days |
| Discovery Method | Transit |
| Discovery Facility | HATNet |
| Discovery Telescope | Canon 200mm f/1.8L |
| Discovery Instrument | 2K CCD Sensor |
| Discovery Date | 2012-04 |
| Reference | Howard et al. 2012 |
At more than 50 Earth masses, HAT-P-17 c is a gas giant, a planet whose mass is mostly made up of hydrogen and helium, like Jupiter and Saturn.
| Mass | 1080.600 Earth masses |
| Density | 2.640 grams per cubic centimeter |
| Radius | 13.100 Earth radiae |
| Semi-major Axis | 5.6 AU |
| Eccentricity | 0.39 |
| Orbital Period | 5584.000 days |
| Discovery Method | Radial Velocity |
| Discovery Facility | W. M. Keck Observatory |
| Discovery Telescope | 10 m Keck I Telescope |
| Discovery Instrument | HIRES Spectrometer |
| Discovery Date | 2012-04 |
| Reference | Howard et al. 2012 |