Kepler-20f
From Infogalactic: the planetary knowledge core
| 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) | 0.66-3.04 M⊕ |
| Radius | (r) | 1.034+0.100 −0.127 R⊕ |
| Temperature | (T) | 705 K (432 °C; 809 °F) |
| Orbital elements | ||
| Semi-major axis | (a) | 0.1104 AU |
| Eccentricity | (e) | <0.32 |
| Orbital period | (P) | 19.57706 d |
| Inclination | (i) | 88.68+0.17 −0.14° |
| Discovery information | ||
| Discovery date | 20 December 2011 | |
| Discoverer(s) | Kepler team | |
| Discovery method | Transit (Kepler Mission) | |
| Discovery status | Conference announcement | |
Kepler-20f is an exoplanet orbiting Kepler-20. The planet is notable as it has the closest radius to Earth known so far. The planet is fourth closest to the star, and at 705 K (432 °C; 809 °F), too hot to have liquid water on its surface. Instead, it is expected to have an atmosphere of water vapour. Along with the other four planets in the system, Kepler-20f was announced on 20 December 2011.
Orbit
With a semimajor axis of 0.1104 AU, Kepler-20f's orbit has a period of 19.57706 days (with an extremely small margin of error). The planet also has an inclination of 88.68°, which of course makes its transits observable from the Solar System. Like the other planets of the system, the planet has a high maximum eccentricity of 0.32.
