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Kepler-138 b is a Rocky exoplanet (a small, dense world with a solid surface), smaller than Earth at 0.64 Earth radii. It has an equilibrium temperature of 452 K (179°C). The planet completes one orbit around its star every 10.3 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
0.1
Earth Masses
0.64
Earth Radii
452
Temperature (K)
Discovery Information
Discovery MethodTransit
Discovery Year2,014
Discovery FacilityKepler
Orbital Properties
Orbital Period10.3134 days
Semi-Major Axis0.0753 AU
Eccentricity0.02
Inclination88.67 deg
Physical Properties
Mass (Jupiter)0.0002 MJ
Mass (Earth)0.07 M⊕
Radius (Jupiter)0.0571 RJ
Radius (Earth)0.64 R⊕
Density1.7 g/cm3
Eq. Temperature452 K
Insolation Flux9.9 S⊕
Planetary Extremes
Where Kepler-138 b sits on the spectrum of all known exoplanets.
Mass0.1 M⊕
FeatherweightColossus
Radius0.64 R⊕
TinyEnormous
Temperature452 K
FrozenInferno
Year Length10.3 days
LightningGlacial
Density1.70 g/cm³
FluffyIron-dense
Star Distance0.075 AU
ScorchedFrozen exile
Star System View
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Size Comparison
0.64x Earth's radius
Orbit Comparison
Earth: 365.25 days (1 AU)Kepler-138 b: 10.3 Earth days (0.075 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?
12.0 kg
Your weight (from 70 kg)
0.17g
Feather-light
Walking feels like bounding on a trampoline.
10.3 Earth days
Year length
Unknown sunrise
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