GJ 251 b
A confirmed exoplanet orbiting GJ 251.
Compared with Earth
- Mass
- About 3.9 times Earth's mass.
- Temperature
- About 63 °C (145 °F) from starlight alone, against -18 °C (-1 °F) for Earth measured the same way.
- Starlight
- About 2.4 times the starlight Earth gets from the Sun.
- Year
- A year here lasts about 14 Earth days.
Planet
- Radius
- Unknown
- Mass
- 3.85 × Earth
- Density
- Unknown
- Equilibrium temperature
- 336 K
- Starlight received
- 2.37 × Earth
- Orbital period
- 14.24 days
- Average distance from its star
- 0.0808 AU
Star
- Host star
- GJ 251
- Spectral class
- M — red dwarf
- Surface temperature
- 3,342 K
- Radius
- 0.36 × Sun
- Mass
- 0.35 × Sun
- Age
- 6.8 billion years
System
- Distance from Earth
- 18.2 light-years (5.581 parsecs)
- Stars in system
- 1
- Known planets
- 2
Discovery
- Year
- 2020
- Method
- Radial Velocity
- Facility
- W. M. Keck Observatory
Data from the NASA Exoplanet Archive, synced October 14, 2026.