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Exoplanet List of exoplanets
Parent star
Star Kepler-68 (KOI 246)
Constellation Cygnus
Right ascension (α) 19h 24m 07.7651s[1]
Declination (δ) +49° 02′ 24.936″[1]
Apparent magnitude (mV) 8.588
Distance490±20[1] ly
(149±5[1] 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) 1,280 K (1,010 °C; 1,840 °F)
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.[2] Doppler measurements were made to determine its mass to be 5.79 times that of Earth (0.026 MJ).[3]

With a density of 2.6 g/cm3 it has physical characteristics of both a super-Earth and a mini-Neptune.[4]

See also[edit]


  1. ^ a b c d Brown, A. G. A; et al. (2016). "Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties". Astronomy and Astrophysics. 595. A2. arXiv:1609.04172. Bibcode:2016A&A...595A...2G. doi:10.1051/0004-6361/201629512.Gaia Data Release 1 catalog entry
  2. ^ Gilliland, Ronald L.; et al. (2013). "Kepler-68: Three Planets, One with a Density Between That of Earth and Ice Giants". The Astrophysical Journal. 766. 40. arXiv:1302.2596. Bibcode:2013ApJ...766...40G. doi:10.1088/0004-637X/766/1/40.
  3. ^
  4. ^ Masses, radii, and orbits of small Kepler planets: the transition from gaseous to rocky planets accessdate=8 January 2014