CONFIRMED EXOPLANET
·
Sub-Neptune
Kepler-257 d
Orbits Host Star: Kepler-257
· Distance: 2544.900 Light-Years (780.256 pc)
Planetary Radius
4.950 R⊕
Planetary Mass
21.700 M⊕
Surface Gravity
0.89 g / g⊕
Equilibrium Temp
567K (+294°C / +561°F)
Orbital Period
24.665 days
Discovery Year
2014 (Transit)
Habitability Assessment
⚠️ Thermal Exclusions: High equilibrium temperature (567 K · +294°C / +561°F) places this world well interior to the runaway greenhouse threshold.
Discovery Facility: Kepler.
Other Worlds in the Kepler-257 System (2)
NASA EXOPLANET ARCHIVE COMPOSITE PARAMETERS