The Kepler-20 System
Kepler-20 is a planetary system in the constellation Lyra hosting 6 confirmed exoplanets around 2 stars, about 922 light-years from Earth.
Size Comparison: The Planets of Kepler-20
Planets without a measured radius are not shown.
Star Kepler-20 and Its Habitable Zone
Kepler-20
- Surface temperature
- 5,495 K (Sun: 5,772 K)
- Mass
- 0.93 M☉
- Radius
- 0.92 R☉
- Age
- 5.6 billion years (Sun: 4.6)
Habitable zone of Kepler-20: 0.632–1.502 AU (conservative: 0.801–1.424 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
See the full interactive habitable-zone view in the Exoplanet Explorer app ›
All 6 Planets in the Kepler-20 System
| Planet | Type | Orbit | Radius | ESI | Discovered |
|---|---|---|---|---|---|
| Kepler-20 b | Super Earth | 3.7 d | 1.77 R⊕ | 0.27 | 2011 |
| Kepler-20 c | Mini Neptune | 11 d | 2.89 R⊕ | 0.23 | 2011 |
| Kepler-20 d | Super Earth | 78 d | 2.61 R⊕ | 0.41 | 2011 |
| Kepler-20 e | Terrestrial | 6.1 d | 0.82 R⊕ | 0.30 | 2011 |
| Kepler-20 f | Terrestrial | 20 d | 0.95 R⊕ | 0.33 | 2011 |
| Kepler-20 g | Neptune-like | 35 d | — | 0.23 | 2016 |
Discovery History
The first planet found here, Kepler-20 b, was discovered in 2011 using the transit method. The most recent addition, Kepler-20 g, followed in 2016.
- 2011 — Kepler-20 b (Transit)
- 2011 — Kepler-20 c (Transit)
- 2011 — Kepler-20 d (Transit)
- 2011 — Kepler-20 e (Transit)
- 2011 — Kepler-20 f (Transit)
- 2016 — Kepler-20 g (Radial Velocity)
Frequently Asked Questions About Kepler-20
How many planets does Kepler-20 have?
Kepler-20 has 6 confirmed exoplanets distributed around its 2 stars. More may await discovery.
Are any planets in the Kepler-20 system habitable?
None of the known planets in Kepler-20 orbit within the star's habitable zone.
How far away is Kepler-20?
Kepler-20 is about 922 light-years from Earth in the constellation Lyra.