Kepler-22 is a star, located in the northern constellation of Cygnus. the swan, that is orbited by a planet found to be unequivocally within the star's habitable zone. The estimated distance of Kepler-22 is approximately 620 light-years away (190 parsecs) from Earth.
Kepler-22 is slightly smaller and cooler then the Sun, with a lower abundance of elements having more mass than helium. It has a spectral type of G5, while the luminosity class remains undetermined. This star is radiating 79% of the Sun's luminosity from its outer atmosphere, at an effective temperature of 5,518 K (9472 °F, 5244 °C), giving it the yellow-hued glow of a G-type star.
On December 5th, 2011, scientists from the KEpler mission announced that a possible Earthlike world (Kepler-22b), had been discovered orbiting in the star's habitable zone, by NASA's Kepler spacecraft.
|Planet||Mass||Semimajor axis||Orbital period (days)||Eccentricity||Inclination||Radius|
|b||< 0.11 Jupiter mass||0.849 ± 0.018 AU||289.8623 days||N/A||N/A||2.4 Earth radius|