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K2-123 b is a Neptune-like exoplanet (an ice giant with a thick atmosphere), about 2.8 times the radius of Earth. It has an equilibrium temperature of 338 K (65°C). The planet completes one orbit around its star every 31.0 Earth days. It was discovered in 2017 using the transit method. It orbits the star K2-123, located approximately 162 parsecs (527 light-years) from Earth.
2017
Discovered
2.76
Earth Radii
338
Temperature (K)
Discovery Information
Discovery MethodTransit
Discovery Year2,017
Discovery FacilityK2
Orbital Properties
Orbital Period30.9515 days
Semi-Major Axis0.1649 AU
Physical Properties
Radius (Jupiter)0.2462 RJ
Radius (Earth)2.76 R⊕
Eq. Temperature338 K
Planetary Extremes
Where K2-123 b sits on the spectrum of all known exoplanets.
Radius2.76 R⊕
TinyEnormous
Temperature338 K
FrozenInferno
Year Length31.0 days
LightningGlacial
Star Distance0.165 AU
ScorchedFrozen exile
Star System View
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Size Comparison
2.76x Earth's radius (0.25x Jupiter)
Orbit Comparison
Earth: 365.25 days (1 AU)K2-123 b: 31.0 Earth days (0.165 AU)
Host Star: K2-123
Effective Temperature4,035 K
Mass0.62 M☉
Radius0.59 R☉
Size vs Sun1.69x smaller
Metallicity [Fe/H]0.03
Distance (pc)161.555 pc
Distance (ly)526.9 light-years
Planets in the K2-123 System
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