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KOI-55 c is a Rocky exoplanet (a small, dense world with a solid surface), smaller than Earth at 0.87 Earth radii. The planet completes one orbit around its star every 8.2 hours. It was discovered in 2011 using the orbitalbrightnessmodulation method. It orbits the B-type star KOI-55, located approximately 1231 parsecs (4015 light-years) from Earth.
2011
Discovered
0.7
Earth Masses
0.87
Earth Radii
Discovery Information
Discovery MethodOrbital Brightness Modulation
Discovery Year2,011
Discovery FacilityKepler
Orbital Properties
Orbital Period0.3429 days
Semi-Major Axis0.0076 AU
Inclination65 deg
Physical Properties
Mass (Jupiter)0.0021 MJ
Mass (Earth)0.655 M⊕
Radius (Jupiter)0.0773 RJ
Radius (Earth)0.867 R⊕
Planetary Extremes
Where KOI-55 c sits on the spectrum of all known exoplanets.
Mass0.7 M⊕
FeatherweightColossus
Radius0.87 R⊕
TinyEnormous
Year Length8.2 hrs
LightningGlacial
Star Distance7.6e-3 AU
ScorchedFrozen exile
Star System View
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Size Comparison
0.87x Earth's radius
Orbit Comparison
Earth: 365.25 days (1 AU)KOI-55 c: 8.2 hours (0.008 AU)
Host Star: KOI-55
Spectral TypeB
Effective Temperature27,730 K
Mass0.496 M☉
Radius0.203 R☉
Size vs Sun4.93x smaller
Luminosity22.9087 L☉
Luminosity vs Sun22.909x brighter
Distance (pc)1,231.02 pc
Distance (ly)4015.0 light-years
Planets in the KOI-55 System
What If You Lived Here?
61.0 kg
Your weight (from 70 kg)
0.87g
Earth-like
Feels just like home — comfortably familiar.
8.2 hours
Year length
Blue-White sunrise
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