Kepler-20b

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Kepler-20b
Extrasolar planet List of extrasolar planets
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
−0.095
 R
Temperature (T) 5,466 ± 93 K
Metallicity [Fe/H] 0.02 ± 0.04
Age 8.8+4.7
−2.7
 Gyr
Physical characteristics
Mass (m) 8.7 +2.1
−2.2
M
Radius (r) 1.91 +0.12
−0.21
R
Density (ρ) 6.5 +2.0
−2.7
g cm-3
Temperature (T) 1014 K
Orbital elements
Semimajor axis (a) 0.04537 AU
Eccentricity (e) <0.32
Orbital period (P) 3.6961219 d
Inclination (i) 86.50 +0.36
−0.31
°
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-20b is an exoplanet orbiting Kepler-20. Its radius is about twice that of Earth, but its mass is between 6.5 and nearly 11 Earth masses. It has a density similar to Earth. Along with the other four planets in the system, Kepler-20b was announced on December 20, 2011.