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Kepler-9 d is a Super-Earth exoplanet (a planet larger than Earth but smaller than Neptune), about 1.6 times the radius of Earth. Its scorching equilibrium temperature of 2026 K (1753°C) makes it far too hot for liquid water. Despite its name, Super-Earths are not necessarily habitable; the term refers only to size. The planet completes one orbit around its star every 38 hours. It was discovered in 2010 using the transit method. It orbits the star Kepler-9, located approximately 628 parsecs (2049 light-years) from Earth.
2010
Discovered
1.64
Earth Radii
2026
Temperature (K)
Discovery Information
Discovery MethodTransit
Discovery Year2,010
Discovery FacilityKepler
Orbital Properties
Orbital Period1.5929 days
Semi-Major Axis0.0273 AU
Physical Properties
Radius (Jupiter)0.146 RJ
Radius (Earth)1.64 R⊕
Eq. Temperature2,026 K
Planetary Extremes
Where Kepler-9 d sits on the spectrum of all known exoplanets.
Radius1.64 R⊕
TinyEnormous
Temperature2026 K
FrozenInferno
Year Length1.6 days
LightningGlacial
Star Distance0.027 AU
ScorchedFrozen exile
Star System View
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Size Comparison
1.64x Earth's radius (0.15x Jupiter)
Orbit Comparison
Earth: 365.25 days (1 AU)Kepler-9 d: 38 hours (0.027 AU)
Host Star: Kepler-9
Effective Temperature5,774 K
Mass1.022 M☉
Radius0.958 R☉
Size vs Sun1.04x smaller
Luminosity0.9162 L☉
Luminosity vs Sun1.1x dimmer
Metallicity [Fe/H]0.05
Distance (pc)628.257 pc
Distance (ly)2049.1 light-years
Planets in the Kepler-9 System
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