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Exoplanet List of exoplanets
Parent star
Star Kepler-68 (KOI 246)
Right ascension (α) 19h 24m 07.76s
Declination (δ) +49° 02′ 25″
Apparent magnitude (mV) 8.588
Distance 440 ly
(135 pc)
Mass (m) 1.079±0.051 M
Radius (r) 1.243±0.019 R
Temperature (T) 5793±74 K
Metallicity [Fe/H] 0.12±0.074
Age 6.3 ± 1.7 Gyr
Physical characteristics
Mass (m) 5.79 M
Radius (r) 2.31±0.07 R
Density (ρ) 2.60±0.74 g cm−3
Temperature (T) 1280
Orbital elements
Semi-major axis (a) 0.06170 AU
Orbital period (P) 5.398763 d
Inclination (i) 87.60±0.9°
Discovery information
Discovery date 12 February 2013
Discovery method Transit (Kepler Mission)
Other detection methods Radial velocity
Discovery status Confirmed
Other designations
KOI 246.01

Kepler-68b is an exoplanet orbiting the Sun-like star Kepler-68 in the constellation of Cygnus. Discovered by planetary-transit methods by the Kepler space telescope in February 2013, it has a radius of 2.31 ± 0.07 that of Earth and a density of 2.46–4.3 g/cm3. It has an orbital period of 5.398763 days at a distance of about 0.0617 AU from its star.[1] Doppler measurements were made to determine its mass to be 5.79 times that of Earth (0.026 MJ).[2]

With a density of 2.6 g/cm3 it has physical characteristics of both a super-Earth and a mini-Neptune.[3]

See also[edit]


  1. ^ Gilliland, Ronald L. (2013). "Kepler-68: Three Planets, One With a Density Between That of Earth and Ice Giants". The Astrophysical Journal. 766: 40. arXiv:1302.2596Freely accessible. doi:10.1088/0004-637X/766/1/40. 
  2. ^
  3. ^ Masses, radii, and orbits of small Kepler planets: the transition from gaseous to rocky planets accessdate=8 January 2014