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Extrasolar planet List of extrasolar planets
Parent star
Star Kepler-413 AB
Constellation Cygnus
Right ascension (α) 19h 14m 02.55s
Declination (δ) +51° 09′ 44.9″
Apparent magnitude (mV) 15.52
Distance 2300 ly
Mass (m) 0.82 and 0.5423 M
Radius (r) 0.7761 and 0.484 R
Metallicity [Fe/H] -0.200
Physical characteristics
Mass (m) 0.2110 MJ
Radius (r) 0.388 RJ
Maximum stellar flux (F⊙max) 3.8
Minimum stellar flux (F⊙min) 1.7
Orbital elements
Semimajor axis (a) 0.3553 AU
Eccentricity (e) 0.118
Orbital period (P) 66.262 d
Inclination (i) 2.5 (varies)°
Discovery information
Discovery date 2013
Discovery method Transit (Kepler Mission)
Other detection methods Transit timing variations,
Transit duration variations
Discovery status Confirmed
Other designations
Kepler-413 (AB)-b, KIC12351927b

Kepler-413b (also known as Kepler-413 (AB)-b)) is a circumbinary planet orbiting stars Kepler-413 A and Kepler-413 B, which respectively are K and M dwarfs. These host stars orbit each other with orbital period of 10.1 days.


Kepler-413b was discovered by observing the planet dimming the brightest host star. By looking at transit patterns it was discovered that the planet first made 3 transits in 180 days, then in the next 800 days, there were no transits until the next one. This transit pattern helped to quickly confirm the existence of the planet despite the host stars being relatively faint.[1]

The existence of the planet was first preliminary announced in Kepler Science Conference in November 2013. The final paper was submitted in January 2014.[2]


Kepler-413b is a Neptune sized planet with an orbital period of about 66.262 days. The orbital misalignment of Kepler-413b causes extreme seasonal variations for the planet due to its constantly changing axial tilt.[3]


  1. ^ Kepler-413b: a slightly misaligned, Neptune-size transiting circumbinary planet: Veselin B. Kostov, Peter R. McCullough, Joshua A. Carter, Magali Deleuil, Rodrigo F. Diaz, Daniel C. Fabrycky, Guillaume Hebrard, Tobias C. Hinse, Tsevi Mazeh, Jerome A. Orosz, Zlatan I. Tsvetanov, William F. Welsh
  2. ^ Hit and miss: a slightly misaligned circumbinary planet KIC12351927b
  3. ^