GJ 581 b
A confirmed exoplanet orbiting GJ 581.
Compared with Earth
- Mass
- About 21 times Earth's mass.
- Year
- A year here lasts about 5.4 Earth days.
Planet
- Radius
- Unknown
- Mass
- 20.5 × Earth
- Density
- Unknown
- Equilibrium temperature
- Unknown
- Starlight received
- Unknown
- Orbital period
- 5.369 days
- Average distance from its star
- 0.0399 AU
Star
- Host star
- GJ 581
- Spectral class
- M — red dwarf
- Surface temperature
- 3,500 K
- Radius
- 0.302 × Sun
- Mass
- 0.295 × Sun
- Age
- Unknown
System
- Distance from Earth
- 20.54 light-years (6.298 parsecs)
- Stars in system
- 1
- Known planets
- 3
Discovery
- Year
- 2005
- Method
- Radial Velocity
- Facility
- La Silla Observatory
Data from the NASA Exoplanet Archive, synced October 14, 2026.