The HD 17156 system contains 1 exoplanet. It is located 254.68 light years away from the solar system.
| Mass | 1.41 solar masses |
| Radius | 1.55 solar radiae |
| Temperature | 6040 kelvin |
| Stellar Metallicity | 0.19 decimal exponent |
| Age | 3.37 billion years |
At more than 50 Earth masses, HD 17156 b is a gas giant, a planet whose mass is mostly made up of hydrogen and helium, like Jupiter and Saturn.
| Mass | 1115.583 Earth masses |
| Density | 3.780 grams per cubic centimeter |
| Radius | 12.330 Earth radiae |
| Semi-major Axis | 0.16278 AU |
| Eccentricity | 0.68 |
| Orbital Period | 21.217 days |
| Discovery Method | Radial Velocity |
| Discovery Facility | Subaru Telescope |
| Discovery Telescope | 8.2 m Subaru Telescope |
| Discovery Instrument | HDS Spectrograph |
| Discovery Date | 2007-11 |
| Reference | Fischer et al. 2007 |