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.
- Mass: 0.970 ± 0.060 Solar mass
- Radius: 0.979 ± 0.020 Solar radius
- Luminosity: 0.79 ± 0.04 Solar luminosity
- Temperature: 5,518 K (9472 °F, 5244 °C)
- Metallicity [Fe/H] -0.29 ± 0.06 dex
- Right ascension: 19h 16m 52.2s
- Declination: +47° 53' 4.2"
- Apparent magnitude (V): 11.664
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.
- Mass: <0.11 MJ (Jupiter mass)
- Semimajor axis: 08.49 ± 0.018 AU
- Orbital period: 289 days
- Radius: 2.4 Earth radius