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Exoplanet List of exoplanets
Parent star
Star Kepler-20 (KOI-070)
Constellation Lyra
Right ascension (α) 19h 10m 47.524s
Declination (δ) +42° 20′ 19.30″
Apparent magnitude (mV) 12.51
Mass (m) 0.912±0.035 M
Radius (r) 0.944+0.06
Temperature (T) 5466±93 K
Metallicity [Fe/H] 0.02±0.04
Age 8.8+4.7
Physical characteristics
Mass (m) 16.1+3.3
Radius (r) 3.07+0.20
Density (ρ) 2.91+0.85
g cm−3
Temperature (T) 713
Orbital elements
Semi-major axis (a) 0.0930 AU
Eccentricity (e) <0.40
Orbital period (P) 10.854092 d
Inclination (i) 88.39+0.16
Discovery information
Discovery date 20 December 2011
Discoverer(s) Kepler team
Discovery method Transit (Kepler Mission)
Other detection methods Radial velocity
Discovery status Conference announcement

Kepler-20c is an exoplanet orbiting Kepler-20. It has a mass similar to Neptune but is slightly smaller. Despite being the third closest planet to Kepler-20, it is still close to the star, meaning that it is a Hot Neptune. Along with the other four planets in the system, Kepler-20c was announced on 20 December 2011.