Kepler-20b

Kepler-20b is an exoplanet orbiting Kepler-20 in a system 922 light years from Earth.^[2] It is classified as a Super-Earth, as it has a radius and mass greater than that of Earth. At about 1.87 R_🜨, it would most likely be a Mini-Neptune, but its high mass of 9.7 M_🜨 implies that it is an iron-rich rocky world. Along with the other four planets in the system, Kepler-20b was announced on 20 December 2011.

Kepler-20b

Discovery
Discovered by	Kepler team
Discovery date	20 December 2011
Detection method	Transit (Kepler Mission)
Orbital characteristics
Semi-major axis	0.04537 AU
Eccentricity	<0.32
Orbital period (sidereal)	3.6961219 d
Inclination	86.50+0.36 −0.31
Star	Kepler-20 (KOI-070)
Physical characteristics
Mean radius	1.868+0.066 −0.034 R🜨
Mass	9.7+1.41 −1.44 [1] M🜨
Mean density	8.2+2.0 −2.7 g cm−3
Temperature	1,014 K (741 °C; 1,366 °F)