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Kepler-9 b is a Gas Giant exoplanet (a massive planet composed primarily of hydrogen and helium), about 8.3 times the radius of Earth. The planet completes one orbit around its star every 19.2 Earth days. 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
43.4
Earth Masses
8.29
Earth Radii
Discovery Information
Discovery MethodTransit
Discovery Year2,010
Discovery FacilityKepler
Orbital Properties
Orbital Period19.2389 days
Semi-Major Axis0.143 AU
Eccentricity0.0609
Inclination88.982 deg
Physical Properties
Mass (Jupiter)0.1366 MJ
Mass (Earth)43.4 M⊕
Radius (Jupiter)0.7396 RJ
Radius (Earth)8.29 R⊕
Density0.42 g/cm3
Planetary Extremes
Where Kepler-9 b sits on the spectrum of all known exoplanets.
Mass43.4 M⊕
FeatherweightColossus
Radius8.29 R⊕
TinyEnormous
Year Length19.2 days
LightningGlacial
Density0.42 g/cm³
FluffyIron-dense
Star Distance0.143 AU
ScorchedFrozen exile
Star System View
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Size Comparison
8.29x Earth's radius (0.74x Jupiter)
Orbit Comparison
Earth: 365.25 days (1 AU)Kepler-9 b: 19.2 Earth days (0.143 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
What If You Lived Here?
44.2 kg
Your weight (from 70 kg)
0.63g
Light
Noticeably easier to move. You could jump much higher.
19.2 Earth days
Year length
Unknown sunrise
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