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Kepler-138 d is a Super-Earth exoplanet (a planet larger than Earth but smaller than Neptune), about 1.5 times the radius of Earth. It has an equilibrium temperature of 345 K (72°C). The planet completes one orbit around its star every 23.1 Earth days. It was discovered in 2014 using the transit method. It orbits the star Kepler-138, located approximately 67 parsecs (218 light-years) from Earth.
2014
Discovered
2.1
Earth Masses
1.51
Earth Radii
345
Temperature (K)
Discovery Information
Discovery MethodTransit
Discovery Year2,014
Discovery FacilityKepler
Orbital Properties
Orbital Period23.0923 days
Semi-Major Axis0.1288 AU
Eccentricity0.01
Inclination89.04 deg
Physical Properties
Mass (Jupiter)0.0066 MJ
Mass (Earth)2.1 M⊕
Radius (Jupiter)0.1347 RJ
Radius (Earth)1.51 R⊕
Density3.6 g/cm3
Eq. Temperature345 K
Insolation Flux3.4 S⊕
Planetary Extremes
Where Kepler-138 d sits on the spectrum of all known exoplanets.
Mass2.1 M⊕
FeatherweightColossus
Radius1.51 R⊕
TinyEnormous
Temperature345 K
FrozenInferno
Year Length23.1 days
LightningGlacial
Density3.60 g/cm³
FluffyIron-dense
Star Distance0.129 AU
ScorchedFrozen exile
Star System View
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Size Comparison
1.51x Earth's radius (0.13x Jupiter)
Orbit Comparison
Earth: 365.25 days (1 AU)Kepler-138 d: 23.1 Earth days (0.129 AU)
Host Star: Kepler-138
Effective Temperature3,841 K
Mass0.535 M☉
Radius0.535 R☉
Size vs Sun1.87x smaller
Luminosity0.056 L☉
Luminosity vs Sun17.9x dimmer
Metallicity [Fe/H]-0.18
Distance (pc)66.8624 pc
Distance (ly)218.1 light-years
What If You Lived Here?
64.5 kg
Your weight (from 70 kg)
0.92g
Earth-like
Feels just like home — comfortably familiar.
23.1 Earth days
Year length
Unknown sunrise
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