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.[4]

Discovered byGilliland et al.
Discovery siteKepler Space Observatory
Discovery date2013
Transits, and transit-timing variations
Orbital characteristics[3][1]
0.09059±0.00082 AU
9.605085±0.000072 d
Inclination86.93±0.41 º
Physical characteristics[3]
Mean radius

See alsoEdit


  1. ^ a b c 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 (1). 40. arXiv:1302.2596. Bibcode:2013ApJ...766...40G. doi:10.1088/0004-637X/766/1/40.
  2. ^ "Kepler-68b". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-11-06.
  3. ^ a b Mills, Sean M.; et al. (2019). "Long-period Giant Companions to Three Compact, Multiplanet Systems". The Astronomical Journal. 157 (4). 145. arXiv:1903.07186. Bibcode:2019AJ....157..145M. doi:10.3847/1538-3881/ab0899. S2CID 119197547.
  4. ^ Nasa. "Kepler Discoveries". Archived from the original on 27 May 2010. Retrieved 28 February 2013.