Exoplanet CatalogThe Kepler-257 system (3 planets)
Distance2,544.9 ly
Planets3
Spectral type–
Star Teff5,180 K
Orbital period (days)
2.38
6.58
24.66
| Planet | Period (d) | Radius (R⊕) | Mass (M⊕) | Eq. temp K | Year |
|---|---|---|---|---|---|
| Kepler-257 b | 2.38 | 2.61 | 7.3 | 1,237 | 2014 |
| Kepler-257 c | 6.58 | 5.41 | 25.2 | 881 | 2014 |
| Kepler-257 d | 24.66 | 4.95 | 21.7 | 567 | 2014 |
Values are NASA Exoplanet Archive estimates and may change. Equilibrium temperature is a theoretical value ignoring any atmosphere.