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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