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Observation data
Epoch J2000      Equinox J2000
Constellation Cygnus
Right ascension 19h 25m 0.04s
Declination +49° 13′ 54.6″
Apparent magnitude (V) 11.9
Spectral type G1IV
Distance 1530 ly
(470 pc)
Mass 1.071[1] M
Radius 1.626[1] R
Temperature 5911[1] K
Metallicity [Fe/H] −0.2[1] dex
Other designations
KOI-277, KIC 11401755, 2MASS 19250004+4913545
Database references
KIC data

Kepler-36 is a star in the constellation of Cygnus with two known planets. It has an anomalously large radius, meaning that it is a subgiant.

Planetary system[edit]

On June 21, 2012, the discovery of two planets orbiting the star was announced. The planets, a super-Earth and a "mini-Neptune" are unusual in that they have very close orbits; their semi-major axes differ by only 0.013 AU. The outer planet orbits only 11% further than the inner one. Coupled with masses significantly higher than Earth, their gravitational influence to each other is significant, meaning that their interaction causes extreme transit timing variations for both. Kepler-36b and c have estimated densities of 6.8 and 0.86 g/cm3, respectively.[1] The two planets are close to a 7:6 orbital resonance.[1]

The Kepler-36 planetary system[1]
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
b 4.45 M 0.1153 13.83989 <0.04 90.0° 1.486 R
c 8.08 M 0.1283 16.23855 <0.04 90.0° 3.679 R


  1. ^ a b c d e f g Carter, J. A.; Agol, E.; Chaplin, W. J.; Basu, S.; Bedding, T. R.; Buchhave, L. A.; Christensen-Dalsgaard, J.; Deck, K. M.; Elsworth, Y.; Fabrycky, D. C.; Ford, E. B.; Fortney, J. J.; Hale, S. J.; Handberg, R.; Hekker, S.; Holman, M. J.; Huber, D.; Karoff, C.; Kawaler, S. D.; Kjeldsen, H.; Lissauer, J. J.; Lopez, E. D.; Lund, M. N.; Lundkvist, M.; Metcalfe, T. S.; Miglio, A.; Rogers, L. A.; Stello, D.; Borucki, W. J.; Bryson, S.; Christiansen, J. L.; Cochran, W. D.; Geary, J. C.; Gilliland, R. L.; Haas, M. R.; Hall, J.; Howard, A. W.; Jenkins, J. M.; Klaus, T.; Koch, D. G.; Latham, D. W.; MacQueen, P. J.; Sasselov, D.; Steffen, J. H.; Twicken, J. D.; Winn, J. N. (2012-06-21). "Kepler-36: A Pair of Planets with Neighboring Orbits and Dissimilar Densities". Science. 337 (6094): 556–559. Bibcode:2012Sci...337..556C. PMID 22722249. arXiv:1206.4718Freely accessible. doi:10.1126/science.1223269. 

External links[edit]