The HD 205739 system contains 1 exoplanet. It is located 301.72 light years away from the solar system.
| Mass | 1.22 solar masses |
| Radius | 1.33 solar radiae |
| Temperature | 6176 kelvin |
| Stellar Metallicity | 0.19 decimal exponent |
| Age | 2.84 billion years |
At more than 50 Earth masses, HD 205739 b is a gas giant, a planet whose mass is mostly made up of hydrogen and helium, like Jupiter and Saturn.
| Mass | 435.410 Earth masses |
| Density | 0.951 grams per cubic centimeter |
| Radius | 13.600 Earth radiae |
| Semi-major Axis | 0.896 AU |
| Eccentricity | 0.27 |
| Orbital Period | 279.800 days |
| Discovery Method | Radial Velocity |
| Discovery Facility | Las Campanas Observatory |
| Discovery Telescope | 6.5 m Magellan II Clay Telescope |
| Discovery Instrument | MIKE Spectrograph |
| Discovery Date | 2008-11 |
| Reference | Lopez-Morales et al. 2008 |