Kepler-9 b
Description: Kepler-9b is one of the first planets discovered outside the solar system (exoplanets) by NASA's Kepler Mission. It revolves around the star Kepler-9 within the constellation Lyra. Kepler-9b is the largest of three planets detected in the Kepler system by transit method; its mass is roughly half that of the planet Saturn, and it is the largest planet in its system. Kepler-9b and Kepler-9c display a phenomenon called orbital resonance, in which gravitational pull from each planet alters and stabilizes the orbit of the other. The planet's discovery was announced on August 26, 2010.
Physical Properties
Mass (Jupiter mass): 0.136550986376365 MJ
Radius (Jupiter radius): 0.74 RJ
Density: 0.42 g/cm³
Equilibrium Temperature: 661.0 K
Orbital Parameters
Orbital Period: 19.23891 days
Semi-major Axis: 0.143 AU
Eccentricity: 0.0609
Inclination: 88.982°
Host Star Properties
Host Star: Kepler-9
Spectral Type: Unknown
Temperature: 5774.0 K
Stellar Mass: 1.02 M☉
Stellar Radius: 0.96 R☉
Discovery Information
Planet Letter: b
Object ID: 3.388
Host ID: 2.425688
Discovery Date: 2010-10
Discovery Year: 2010
Discovery Method: Transit
Discovery Locale: Space
Discovery Facility: Kepler
Discovery Instrument: Kepler CCD Array