The Kepler-68 System
Kepler-68 is a planetary system in the constellation Cygnus hosting 4 confirmed exoplanets around 2 stars, about 470 light-years from Earth. One of its planets orbits within the habitable zone, where liquid water could exist on a planetary surface.
Size Comparison: The Planets of Kepler-68
Planets without a measured radius are not shown.
Star Kepler-68 and Its Habitable Zone
Kepler-68
- Surface temperature
- 5,847 K (Sun: 5,772 K)
- Mass
- 1.06 M☉
- Radius
- 1.26 R☉
- Age
- 6.8 billion years (Sun: 4.6)
Habitable zone of Kepler-68: 0.962–2.261 AU (conservative: 1.218–2.144 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-68 System
| Planet | Type | Orbit | Radius | ESI | Discovered |
|---|---|---|---|---|---|
| Kepler-68 b | Super Earth | 5.4 d | 2.36 R⊕ | 0.24 | 2013 |
| Kepler-68 c | Terrestrial | 9.6 d | 0.98 R⊕ | 0.30 | 2013 |
| Kepler-68 d HZ | Cold Gas Giant | 633 d | — | 0.38 | 2013 |
| Kepler-68 e | Cold Gas Giant | 3,455 d | — | 0.16 | 2023 |
Discovery History
The first planet found here, Kepler-68 b, was discovered in 2013 using the transit method. The most recent addition, Kepler-68 e, followed in 2023.
- 2013 — Kepler-68 b (Transit)
- 2013 — Kepler-68 c (Transit)
- 2013 — Kepler-68 d (Radial Velocity)
- 2023 — Kepler-68 e (Radial Velocity)
Frequently Asked Questions About Kepler-68
How many planets does Kepler-68 have?
Kepler-68 has 4 confirmed exoplanets distributed around its 2 stars. More may await discovery.
Are any planets in the Kepler-68 system habitable?
One planet in the system orbits within the habitable zone, where liquid water could exist. Actual habitability depends on atmospheres and composition, which are not yet known.
How far away is Kepler-68?
Kepler-68 is about 470 light-years from Earth in the constellation Cygnus.
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