The star
The star
Kepler-117
- Type
- F8 V
- Surface
- ≈ 6,150 K
- Size
- 1.61 × the Sun
- Mass
- 1.13 × the Sun
- Brightness
- 3.45 × the Sun
- Habitable zone
- 1.36–3.18 AU
The planets
Kepler-117
Kepler-117 b
- Year
- 18.80 days
- Distance from star
- 0.144 AU
- Mass
- 30 Earths
- Size
- 8.1 × Earth
- Temperature
- ≈ 984 K (+711 °C)
- Found
- 2014, transit (Kepler)
Kepler-117
Kepler-117 c
- Year
- 50.79 days
- Distance from star
- 0.28 AU
- Mass
- 1.8 Jupiters
- Size
- 12 × Earth
- Temperature
- ≈ 704 K (+431 °C)
- Found
- 2014, transit (Kepler)
Masses found by the wobble method are minimums, because the orbit's tilt is unknown. Temperatures are equilibrium estimates for a bare planet, before any atmosphere.
How we know
The shadow
The planet passes in front of its star and dims it by a fraction of a percent, every orbit. The dip gives the planet's size and year.
Sources
- Planet and star parameters: NASA Exoplanet Archive, Planetary Systems Composite Parameters, retrieved 1 Nov 2026. This research has made use of the NASA Exoplanet Archive, which is operated by the California Institute of Technology, under contract with NASA under the Exoplanet Exploration Program.
- Position: HYG Database v4.1 (CC BY-SA 4.0).
- Habitable zone: a simple estimate from the star's brightness (√L × 0.95 to 1.67 AU), shown as a guide.