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K2-157 d is a Neptune-like exoplanet (an ice giant with a thick atmosphere) with a mass of 23.3 Earth masses. It has an equilibrium temperature of 429 K (156°C). The planet completes one orbit around its star every 66.5 Earth days. It was discovered in 2025 using the radial velocity method. It orbits the G-type star K2-157, located approximately 298 parsecs (973 light-years) from Earth.
2025
Discovered
23.3
Earth Masses
429
Temperature (K)
Discovery Information
Discovery MethodRadial Velocity
Discovery Year2,025
Discovery FacilityParanal Observatory
Orbital Properties
Orbital Period66.5 days
Semi-Major Axis0.309 AU
Eccentricity0.5
Physical Properties
Mass (Jupiter)0.0732 MJ
Mass (Earth)23.3 M⊕
Eq. Temperature429.1 K
Insolation Flux6.46 S⊕
Planetary Extremes
Where K2-157 d sits on the spectrum of all known exoplanets.
Mass23.3 M⊕
FeatherweightColossus
Temperature429 K
FrozenInferno
Year Length66.5 days
LightningGlacial
Star Distance0.309 AU
ScorchedFrozen exile
Star System View
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Orbit Comparison
Earth: 365.25 days (1 AU)K2-157 d: 66.5 Earth days (0.309 AU)
Host Star: K2-157
Spectral TypeG9 V
Effective Temperature5,334 K
Mass0.89 M☉
Radius0.86 R☉
Size vs Sun1.16x smaller
Metallicity [Fe/H]0.02
Distance (pc)298.373 pc
Distance (ly)973.2 light-years
Planets in the K2-157 System
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