The HD 171238 system contains 1 exoplanet. It is located 146.15 light years away from the solar system.
| Mass | 0.96 solar masses |
| Radius | 1.01 solar radiae |
| Temperature | 5440 kelvin |
| Stellar Metallicity | 0.2 decimal exponent |
| Age | 7.56 billion years |
At more than 50 Earth masses, HD 171238 b is a gas giant, a planet whose mass is mostly made up of hydrogen and helium, like Jupiter and Saturn.
| Mass | 2796.890 Earth masses |
| Density | 7.870 grams per cubic centimeter |
| Radius | 12.500 Earth radiae |
| Semi-major Axis | 2.57 AU |
| Eccentricity | 0.234 |
| Orbital Period | 1532.000 days |
| Discovery Method | Radial Velocity |
| Discovery Facility | La Silla Observatory |
| Discovery Telescope | 1.2 m Leonhard Euler Telescope |
| Discovery Instrument | CORALIE Spectrograph |
| Discovery Date | 2010-02 |
| Reference | Ségransan et al. 2010 |