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Observation data
Epoch J2000      Equinox J2000
Constellation Cygnus[1]
Right ascension 19h 28m 56.8195s[2]
Declination +41° 05′ 09.141″[2]
Apparent magnitude (V) 15.855[3]
Spectral type G5[4]
Proper motion (μ) RA: 2.250±0.065[2] mas/yr
Dec.: −0.326±0.060[2] mas/yr
Parallax (π) 0.9301 ± 0.0360[2] mas
Distance 3,500 ± 100 ly
(1,080 ± 40 pc)
Mass 0.65[3] M
Radius [3] R
Luminosity 0.59[3] L
Temperature 5400[3] K
Metallicity [Fe/H] 0.41[3] dex
Rotational velocity (v sin i) 0.6[3] km/s
Other designations
KOI-935, KIC 9347899, 2MASS J19360552+4551110
Database references
KIC data

Kepler-27 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″.[5] With an apparent visual magnitude of 15.855,[3] this star is too faint to be seen with the naked eye.

The Kepler-27 planetary system[4]
(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 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 h Kepler-31b, NASA Ames Research Center, retrieved 2011-12-06
  4. ^ a b Schneider, Jean, "Star: Kepler-31", Extrasolar Planets Encyclopaedia, Paris Observatory, archived from the original on 2012-04-26, retrieved 2011-12-06
  5. ^ "Kepler Discoveries". 2011-12-05.

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

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