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Observation data
Epoch J2000      Equinox J2000
Constellation [corvus][1]
Right ascension  19h 36m 05.5270s[2]
Declination +45° 51′ 11.106″[2]
Apparent magnitude (V) [3]
Spectral type G5[4]
Proper motion (μ) RA: −1.017±0.043[2] mas/yr
Dec.: −7.344±0.044[2] mas/yr
Parallax (π)0.5722 ± 0.0230[2] mas
Distance5,700 ± 200 ly
(1,750 ± 70 pc)
Mass1.21 ± 0.17[3] M
Radius1.22 ± 0.24[3] R
Luminosity0.79 ± 0.04[3] L
Temperature6340 ± 200[3] K
Metallicity [Fe/H]–0.076 ± 0.400[3] dex
Other designations
KOI-935, KIC 9347899, 2MASS J19360552+4551110
Database references

Kepler-31 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 36m 05.523s}, Declination +45° 51′ 11.09″.[5] With an apparent visual magnitude of 14.0,[3] this star is too faint to be seen with the naked eye.

The Kepler-31 planetary system[4]
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
b 6.8 MJ 0.16 20.8613 4.1 R
c 4.7 MJ 0.26 42.6318 4.1 R


  1. ^ "Cygnus – constellation boundary", The Constellations, International Astronomical Union, retrieved 2011-12-15
  2. ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia Data Release 2 Vizier catalog entry
  3. ^ a b c d e f g Kepler-31b, NASA Ames Research Center, retrieved 2011-12-06
  4. ^ a b Schneider, Jean, "Star: Kepler-23", Extrasolar Planets Encyclopaedia, Paris Observatory, archived from the original on 2012-05-05, retrieved 2011-12-06
  5. ^ "Kepler Discoveries". 2011-12-05.

Coordinates: Sky map 19h 36m 05.523s, +45° 51′ 11.09″