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Observation data
Epoch J2000      Equinox J2000
Constellation Cygnus
Right ascension 19h 37m 59.275s[1]
Declination +46° 41′ 23.14″[1]
Spectral type G / G[2]
Distance 5365 ly
(1645 pc)
Primary Kepler-35A
Companion Kepler-35B
Period (P) 20.73
Semi-major axis (a) 0.176
Mass 0.8877 M
Radius 1.0284 R
Temperature 5606 K
Metallicity -0.13
Mass 0.8094 M
Radius 0.7861 R
Temperature 5202 K
Metallicity -0.13
Other designations
KOI-2937, KIC 9837578, 2MASS J19375927+4641231
Database references
KIC data

Kepler-35 is a binary star system in the constellation of Cygnus. These stars, called Kepler-35A and Kepler-35B have masses of 89% and 81% solar masses respectively, therefore both are spectral class G. They are separated by 0.176 AU, and complete an eccentric orbit around a common center of mass every 20.73 days.[3]

Planetary system[edit]

Kepler-35b is a gas giant that orbits the two stars in the Kepler-35 system. The planet is over an eighth of Jupiter's mass and has a radius of 0.728 Jupiter radii. The planet completes a somewhat eccentric orbit every 131.458 days from a semimajor axis of just over 0.6 AU, only about 3.5 times the semi-major axis between the parent stars. The proximity and eccentricity of the binary star as well as both stars have similar masses results the planet's orbit to significantly deviate from Keplerian orbit.[4] Studies have suggested that this planet must have been formed outside its current orbit and migrated inwards later.[5]

The Kepler-35 planetary system
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
b 0.127 MJ 0.60347 131.458 0.042 90.760° 0.728 RJ

See also[edit]


  1. ^ a b Cutri, R. M. (2003). "2MASS All-Sky Catalog of Point Sources". VizieR On-line Data Catalog. Bibcode:2003yCat.2246....0C. 
  2. ^ Jean Schneider (2012). "Notes for star Kepler-35(AB)". Extrasolar Planets Encyclopaedia. Retrieved 7 April 2012. 
  3. ^ Transiting circumbinary planets Kepler-34 b and Kepler-35 b April 19, 2012 WELSH W., OROSZ J., CARTER J., FABRYCKY D., FORD E., LISSAUER J. & 40 additional authors Nature, 481, 475
  4. ^ Analytic Theory for the Orbits of Circumbinary Planets: Gene C. K. Leung, Man Hoi Lee (HKU)
  5. ^ How not to build Tatooine: the difficulty of in situ formation of circumbinary planets Kepler 16b, Kepler 34b and Kepler 35b July 20, 2012 PAARDEKOOPER S.-J., LEINHARDT Z., THEBAULT Ph. & BARUTEAU C. ApJ. Letters, 754, L16