Exoplanet CatalogExoplanet K2-21 c
Radius2.49 R⊕Earth = 1
Mass6.8 M⊕Earth = 1
Orbital period15.50 d
Equilibrium temp.420 K≈ 147 °C
Distance272.8 ly
Discovered2015Transit
Size compared (radius, Earth = 1)
1.00
2.49
3.88
11.21
Where it sits among all planets (percentile)
41%
39%
60%
20%
23%
Share of planets with a smaller value (of 6,445 planets, where known).
Planets of K2-21 (2)
| Planet | Period (d) | Radius (R⊕) | Mass (M⊕) | Eq. temp K | Year |
|---|---|---|---|---|---|
| K2-21 b | 9.33 | 1.84 | 4.0 | 500 | 2015 |
| K2-21 c | 15.50 | 2.49 | 6.8 | 420 | 2015 |
| Host star | Spectral type | Teff K | Radius (R☉) | Mass (M☉) |
|---|---|---|---|---|
| K2-21 | M0.0 | 4,222 | 0.65 | 0.68 |
Values are NASA Exoplanet Archive estimates and may change. Equilibrium temperature is a theoretical value ignoring any atmosphere.