Exoplanet
GJ 581 b
20.54 light-years
- Discovery
- Radial Velocity · 2005
- Radius
- 4.79 Earth radii
- Mass
- 20.5 (+6.2 / −3.5) Earth masses
- Orbital period
- 5.3686 (+1 × 10⁻⁴ / −1 × 10⁻⁴) days
- Semi-major axis
- 0.0399 (+5 × 10⁻⁴ / −5 × 10⁻⁴) AU
- Equilibrium temperature
- 464.32 (+5.93 / −5.93) K
- Mass provenance
- Mass
Measurements may come from different studies and need not form one self-consistent model. “Msini” is a minimum mass; a mass inferred from radius is an estimate. Equilibrium temperature is a model estimate, not a measured surface temperature or evidence of habitability.
NASA archive record and references ↗
Snapshot retrieved: 2026-10-11T04:15:07.688253+00:00