Epoch J2000 Equinox J2000
|19h 16m 52.1904s|
|Declination||+47° 53′ 03.948″|
|Proper motion (?)|| RA:  mas/yr |
Dec.:  mas/yr
|Parallax (?)||5.1088 ± 0.0242 mas|
|Distance||638 ± 3 ly |
(195.7 ± 0.9 pc)
|Absolute magnitude (MV)||~5.27|
|Luminosity (bolometric)||0.8 L☉|
|Luminosity (visual, LV)||~0.67 L☉|
|Metallicity [Fe/H]|| dex|
|Rotational velocity (v sin i)|| km/s|
, , , 
Kepler-22 is a star in the northern constellation of Cygnus, the swan, that is orbited by a planet found to be unequivocally within the star's habitable zone. It is located at the celestial coordinates: Right Ascension 19h 16m 52.2s, Declination +47° 53′ 4.2″. With an apparent visual magnitude of 11.7, this star is too faint to be seen with the naked eye. It can be viewed with a telescope having an aperture of at least 4 in (10 cm). The estimated distance to Kepler-22 is 638 light-years (196 parsecs).
Kepler-22 is slightly smaller and cooler than the Sun, with a lower abundance of elements having more mass than helium. It has a spectral type of G5V, 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, giving it the yellow-hued glow of a G-type star. A projected rotational velocity of 0.6 km/s suggests it has a low period of rotation.
On December 5, 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. This was significant in that it was the first relatively Earth-sized extrasolar planet (about twice as big) confirmed to be orbiting within a star's habitable zone.
(in order from star)
|b||< 0.11 MJ||0.849 ± 0.018||289.8623 +0.016