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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
Maximum mass (m sin i) 7.3 M
Radius (r) 0.953 R
Density (ρ) 5–40 g cm−3
Temperature (T) 944
Orbital elements
Semi-major axis (a) 0.09059 AU
Orbital period (P) 9.605085 d
Inclination (i) 86.93 ± 0.41°
Discovery information
Discovery date 12 February 2013
Discovery method Transit (Kepler Mission)
Discovery status Confirmed
Other designations
KOI 246.02

Kepler-68c is an Earth-sized planet orbiting the star Kepler-68 in the constellation of Cygnus. It was discovered by planetary-transit methods by the Kepler space telescope in February 2013. It has a mass of 4.8+2.5
times that of Earth (0.015 MJ)[1] and a radius of 0.953+0.037
Earth radii. It has an orbital period of 9.605085 days at a distance of about 0.09059 AU from its star. Relatively wide constraints on Kepler-68c's mass are the result lack of detection of the planet through radial-velocity and transit-timing-variation methods.[2]

See also[edit]


  1. ^ Gilliland, Ronald L. "Kepler-68: Three Planets, One With a Density Between That of Earth and Ice Giants". arXiv:1302.2596Freely accessible. 
  2. ^ Nasa. "Kepler Discoveries". Retrieved 28 February 2013.