The Kepler-256 System
Kepler-256 is a planetary system in the constellation Cygnus hosting 4 confirmed exoplanets, about 3,348 light-years from Earth.
Size Comparison: The Planets of Kepler-256
Kepler-256: Star and Habitable Zone
Kepler-256
- Surface temperature
- 5,551 K (Sun: 5,772 K)
- Radius
- 1.30 R☉
Habitable zone of Kepler-256: 0.913–2.166 AU (conservative: 1.157–2.053 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 4 Planets in the Kepler-256 System
| Planet | Type | Orbit | Radius | ESI | Discovered |
|---|---|---|---|---|---|
| Kepler-256 b | Super Earth | 1.6 d | 1.59 R⊕ | 0.28 | 2014 |
| Kepler-256 c | Mini Neptune | 3.4 d | 2.15 R⊕ | 0.25 | 2014 |
| Kepler-256 d | Mini Neptune | 5.8 d | 2.48 R⊕ | 0.24 | 2014 |
| Kepler-256 e | Mini Neptune | 11 d | 2.35 R⊕ | 0.25 | 2014 |
Discovery History
The first planet found here, Kepler-256 b, was discovered in 2014 using the transit method.
- 2014 — Kepler-256 b (Transit)
- 2014 — Kepler-256 c (Transit)
- 2014 — Kepler-256 d (Transit)
- 2014 — Kepler-256 e (Transit)
Frequently Asked Questions About Kepler-256
How many planets does Kepler-256 have?
Kepler-256 has 4 confirmed exoplanets. More may await discovery.
Are any planets in the Kepler-256 system habitable?
None of the known planets in Kepler-256 orbit within the star's habitable zone.
How far away is Kepler-256?
Kepler-256 is about 3,348 light-years from Earth in the constellation Cygnus.
Explore the Kepler-256 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.
