The Kepler-186 System
Kepler-186 is a planetary system in the constellation Cygnus hosting 5 confirmed exoplanets, about 579 light-years from Earth.
Size Comparison: The Planets of Kepler-186
Kepler-186: Star and Habitable Zone
Kepler-186
- Spectral type
- M1
- Surface temperature
- 3,788 K (Sun: 5,772 K)
- Mass
- 0.48 M☉
- Radius
- 0.47 R☉
- Luminosity
- 0.0412 L☉
- Age
- 4.0 billion years (Sun: 4.6)
Habitable zone of Kepler-186: 0.165–0.423 AU (conservative: 0.209–0.401 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 5 Planets in the Kepler-186 System
| Planet | Type | Orbit | Radius | ESI | Discovered |
|---|---|---|---|---|---|
| Kepler-186 b | Terrestrial | 3.9 d | 1.07 R⊕ | 0.33 | 2014 |
| Kepler-186 c | Terrestrial | 7.3 d | 1.25 R⊕ | 0.35 | 2014 |
| Kepler-186 d | Super Earth | 13 d | 1.40 R⊕ | 0.46 | 2014 |
| Kepler-186 e | Super Earth | 22 d | 1.27 R⊕ | 0.60 | 2014 |
| Kepler-186 f | Terrestrial | 130 d | 1.17 R⊕ | 0.61 | 2014 |
Discovery History
The first planet found here, Kepler-186 b, was discovered in 2014 using the transit method.
- 2014 — Kepler-186 b (Transit)
- 2014 — Kepler-186 c (Transit)
- 2014 — Kepler-186 d (Transit)
- 2014 — Kepler-186 e (Transit)
- 2014 — Kepler-186 f (Transit)
Frequently Asked Questions About Kepler-186
How many planets does Kepler-186 have?
Kepler-186 has 5 confirmed exoplanets. More may await discovery.
Are any planets in the Kepler-186 system habitable?
None of the known planets in Kepler-186 orbit within the star's habitable zone.
How far away is Kepler-186?
Kepler-186 is about 579 light-years from Earth in the constellation Cygnus.
Explore the Kepler-186 system in the app
Browse, filter and compare 6,000+ exoplanets on iPhone, iPad and Apple Watch — with habitable-zone views, widgets and offline data.
