HD 99109 b
A confirmed exoplanet orbiting HD 99109.
Compared with Earth
- Mass
- About 140 times Earth's mass.
- Year
- A year here lasts about 1.2 Earth years.
Planet
- Radius
- Unknown
- Mass
- 139.8 × Earth
- Density
- Unknown
- Equilibrium temperature
- Unknown
- Starlight received
- Unknown
- Orbital period
- 439.3 days
- Average distance from its star
- 1.11 AU
Star
- Host star
- HD 99109
- Spectral class
- K — orange dwarf
- Surface temperature
- 5,282 K
- Radius
- 0.98 × Sun
- Mass
- 0.76 × Sun
- Age
- Unknown
System
- Distance from Earth
- 178.7 light-years (54.79 parsecs)
- Stars in system
- 1
- Known planets
- 1
Discovery
- Year
- 2005
- Method
- Radial Velocity
- Facility
- W. M. Keck Observatory
Data from the NASA Exoplanet Archive, synced October 14, 2026.