Exoplanet CatalogExoplanet GJ 581 b
Radius4.79 R⊕Earth = 1
Mass20.5 M⊕Earth = 1
Orbital period5.37 d
Equilibrium temp.464 K≈ 191 °C
Distance20.5 ly
Discovered2005Radial Velocity
Size compared (radius, Earth = 1)
1.00
3.88
4.79
11.21
Where it sits among all planets (percentile)
64%
62%
31%
23%
1%
Share of planets with a smaller value (of 6,445 planets, where known).
Planets of GJ 581 (3)
| Planet | Period (d) | Radius (R⊕) | Mass (M⊕) | Eq. temp K | Year |
|---|---|---|---|---|---|
| GJ 581 e | 3.15 | 1.38 | 2.5 | 554 | 2009 |
| GJ 581 b | 5.37 | 4.79 | 20.5 | 464 | 2005 |
| GJ 581 c | 12.92 | 2.50 | 6.8 | 346 | 2007 |
| Host star | Spectral type | Teff K | Radius (R☉) | Mass (M☉) |
|---|---|---|---|---|
| GJ 581 | M3.0 V | 3,500 | 0.30 | 0.30 |
Values are NASA Exoplanet Archive estimates and may change. Equilibrium temperature is a theoretical value ignoring any atmosphere.