The Kepler-31 System
Kepler-31 is a planetary system in the constellation Cygnus hosting 3 confirmed exoplanets, about 5,429 light-years from Earth.
Size Comparison: The Planets of Kepler-31
Kepler-31: Star and Habitable Zone
Kepler-31
- Surface temperature
- 6,340 K (Sun: 5,772 K)
- Mass
- 1.21 M☉
- Radius
- 1.22 R☉
Habitable zone of Kepler-31: 1.065–2.479 AU (conservative: 1.349–2.351 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-31 System
| Planet | Type | Orbit | Radius | ESI | Discovered |
|---|---|---|---|---|---|
| Kepler-31 b | Neptune-like | 21 d | 5.50 R⊕ | 0.15 | 2011 |
| Kepler-31 c | Neptune-like | 43 d | 5.30 R⊕ | 0.18 | 2011 |
| Kepler-31 d | Super Earth | 88 d | 3.90 R⊕ | 0.27 | 2014 |
Discovery History
The first planet found here, Kepler-31 b, was discovered in 2011 using the transit method. The most recent addition, Kepler-31 d, followed in 2014.
- 2011 — Kepler-31 b (Transit)
- 2011 — Kepler-31 c (Transit)
- 2014 — Kepler-31 d (Transit)
Frequently Asked Questions About Kepler-31
How many planets does Kepler-31 have?
Kepler-31 has 3 confirmed exoplanets. More may await discovery.
Are any planets in the Kepler-31 system habitable?
None of the known planets in Kepler-31 orbit within the star's habitable zone.
How far away is Kepler-31?
Kepler-31 is about 5,429 light-years from Earth in the constellation Cygnus.
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