Kepler-20d

Kepler-20d
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
−0.095
 R
Temperature (T) 5466±93 K
Metallicity [Fe/H] 0.02±0.04
Age 8.8+4.7
−2.7
 Gyr
Physical characteristics
Mass(m)<20.1 M
Radius(r)2.75+0.17
−0.30
R
Density(ρ)<4.07 g cm−3
Temperature (T) 369 K (96 °C; 205 °F)
Orbital elements
Semi-major axis(a) 0.3453 AU
Eccentricity (e) <0.60
Orbital period(P) 77.61184 d
Inclination (i) 89.570°
Discovery information
Discovery date 20 December 2011
Discoverer(s) Kepler team
Discovery method Transit (Kepler Mission)
Discovery status Conference announcement

Kepler-20d is an exoplanet orbiting Kepler-20. It has a mass and radius similar to Neptune. Despite being the furthest planet from the star, it has an orbit similar to Mercury, meaning that it is a Hot Neptune. Along with the other four planets in the system, Kepler-20d was announced on December 20, 2011.

Sources

http://kepler.nasa.gov/Mission/discoveries/kepler20d/


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