The Kepler-81 System
Kepler-81 is a planetary system in the constellation Cygnus hosting 3 confirmed exoplanets, about 1,136 light-years from Earth.
Size Comparison: The Planets of Kepler-81
Kepler-81: Star and Habitable Zone
Kepler-81
- Surface temperature
- 4,500 K (Sun: 5,772 K)
- Radius
- 0.60 R☉
Habitable zone of Kepler-81: 0.289–0.713 AU (conservative: 0.366–0.676 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 3 Planets in the Kepler-81 System
| Planet | Type | Orbit | Radius | ESI | Discovered |
|---|---|---|---|---|---|
| Kepler-81 b | Mini Neptune | 6.0 d | 2.42 R⊕ | 0.26 | 2012 |
| Kepler-81 c | Mini Neptune | 12 d | 2.37 R⊕ | 0.30 | 2012 |
| Kepler-81 d | Terrestrial | 21 d | 1.21 R⊕ | 0.45 | 2014 |
Discovery History
The first planet found here, Kepler-81 b, was discovered in 2012 using the transit method. The most recent addition, Kepler-81 d, followed in 2014.
- 2012 — Kepler-81 b (Transit)
- 2012 — Kepler-81 c (Transit)
- 2014 — Kepler-81 d (Transit)
Frequently Asked Questions About Kepler-81
How many planets does Kepler-81 have?
Kepler-81 has 3 confirmed exoplanets. More may await discovery.
Are any planets in the Kepler-81 system habitable?
None of the known planets in Kepler-81 orbit within the star's habitable zone.
How far away is Kepler-81?
Kepler-81 is about 1,136 light-years from Earth in the constellation Cygnus.
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