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Observation data
Epoch J2000      Equinox J2000
Constellation Cygnus[1]
Right ascension 19h 28m 56.825s
Declination +41° 05′ 09.15″
Apparent magnitude (V) 15.855[2]
Spectral type G5[3]
Distance 2638[3] ly
(809 pc)
Mass 0.65[2] M
Radius [2] R
Luminosity 0.59[2] L
Temperature 5400[2] K
Metallicity [Fe/H] 0.41[2] dex
Rotational velocity (v sin i) 0.6[2] km/s
Other designations
KOI-935, KIC 9347899, 2MASS J19360552+4551110
Database references
KIC data

Kepler-2 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 28m 56.825s, Declination +41° 05′ 09.15″.[4] With an apparent visual magnitude of 15.855,[2] this star is too faint to be seen with the naked eye.

The Kepler-27 planetary system[3]
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
b 9.11 MJ 0.118 15.3348
c 13.8 MJ 0.191 31.3309 4.1 R


  1. ^ "Cygnus – constellation boundary", The Constellations, International Astronomical Union, retrieved 2011-12-15 
  2. ^ a b c d e f g h Kepler-31b, NASA Ames Research Center, retrieved 2011-12-06 
  3. ^ a b c Schneider, Jean, "Star: Kepler-31", Extrasolar Planets Encyclopaedia, Paris Observatory, archived from the original on 2012-04-26, retrieved 2011-12-06 
  4. ^ "Kepler Discoveries". 2011-12-05. 

Coordinates: Sky map 19h 28m 56.825s, +41° 05′ 09.15″