The Kepler-9 System
Kepler-9 is a planetary system in the constellation Lyra hosting 3 confirmed exoplanets, about 2,049 light-years from Earth.
Size Comparison: The Planets of Kepler-9
Kepler-9: Star and Habitable Zone
Kepler-9
- Surface temperature
- 5,777 K (Sun: 5,772 K)
- Mass
- 1.07 M☉
- Radius
- 1.02 R☉
- Age
- 1.0 billion years (Sun: 4.6)
Habitable zone of Kepler-9: 0.765–1.803 AU (conservative: 0.969–1.709 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-9 System
| Planet | Type | Orbit | Radius | ESI | Discovered |
|---|---|---|---|---|---|
| Kepler-9 b | Cold Gas Giant | 19 d | 8.29 R⊕ | 0.13 | 2010 |
| Kepler-9 c | Cold Gas Giant | 39 d | 8.08 R⊕ | 0.16 | 2010 |
| Kepler-9 d | Lava World | 1.6 d | 1.64 R⊕ | 0.27 | 2010 |
Discovery History
The first planet found here, Kepler-9 b, was discovered in 2010 using the transit method.
- 2010 — Kepler-9 b (Transit)
- 2010 — Kepler-9 c (Transit)
- 2010 — Kepler-9 d (Transit)
Frequently Asked Questions About Kepler-9
How many planets does Kepler-9 have?
Kepler-9 has 3 confirmed exoplanets. More may await discovery.
Are any planets in the Kepler-9 system habitable?
None of the known planets in Kepler-9 orbit within the star's habitable zone.
How far away is Kepler-9?
Kepler-9 is about 2,049 light-years from Earth in the constellation Lyra.
Explore the Kepler-9 system in the app
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