Kepler-68c

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
−3.6 times that of Earth (0.015 MJ)[1] and a radius of 0.953+0.037
−0.042 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]

Kepler-68c
Discovery
Discovery date12 February 2013
Transit (Kepler Mission)
Orbital characteristics
0.09059 AU (13,552,000 km)
9.605085 d
Inclination86.93 ± 0.41
StarKepler-68 (KOI-246)
Physical characteristics
Mean radius
0.953 R⊕
Mean density
5–40 g cm−3
Temperature944 K (671 °C; 1,240 °F)
    Kepler-68c
    Discovery[1]
    Discovered byGilliland et al.
    Discovery siteKepler Space Observatory
    Discovery date2013
    Transits, and transit-timing variations
    Designations
    KOI-246.01[2]
    Orbital characteristics[3][1]
    0.09059±0.00082 AU
    9.605085±0.000072 d
    Inclination86.93±0.41 º
    Semi-amplitude0.59+0.50
    −0.52     m/s
    StarKepler-68
    Physical characteristics[3]
    Mean radius
    		0.953+0.037
    −0.042     R⊕
    Mass2.02+1.72
    −1.78     M⊕

      See also
      • List of planets discovered by the Kepler spacecraft

      References
      1. 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. 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.
      4. Nasa. "Kepler Discoveries". Nasa.gov. Retrieved 28 February 2013.


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