The HD 99109 system contains 1 exoplanet. It is located 178.70 light years away from the solar system.
| Mass | 0.76 solar masses |
| Radius | 0.98 solar radiae |
| Temperature | 5282 kelvin |
| Stellar Metallicity | 0.35 decimal exponent |
| Age | 1 billion years |
At more than 50 Earth masses, HD 99109 b is a gas giant, a planet whose mass is mostly made up of hydrogen and helium, like Jupiter and Saturn.
| Mass | 139.845 Earth masses |
| Density | 0.263 grams per cubic centimeter |
| Radius | 14.300 Earth radiae |
| Semi-major Axis | 1.11 AU |
| Eccentricity | 0.09 |
| Orbital Period | 439.300 days |
| Discovery Method | Radial Velocity |
| Discovery Facility | W. M. Keck Observatory |
| Discovery Telescope | 10 m Keck I Telescope |
| Discovery Instrument | HIRES Spectrometer |
| Discovery Date | 2006-07 |
| Reference | Butler et al. 2006 |