The star
The star
Kepler-197
- Type
- white star
- Surface
- ≈ 6,004 K
- Size
- 1.12 × the Sun
- Mass
- 0.86 × the Sun
- Brightness
- 1.67 × the Sun
- Habitable zone
- 0.956–2.24 AU
The planets
Kepler-197
Kepler-197 b
- Year
- 5.60 days
- Distance from star
- 0.06 AU
- Mass
- 1 Earths
- Size
- 1 × Earth
- Temperature
- ≈ 1142 K (+869 °C)
- Found
- 2014, transit (Kepler)
Kepler-197
Kepler-197 c
- Year
- 10.35 days
- Distance from star
- 0.09 AU
- Mass
- 5.3 Earths
- Size
- 1.2 × Earth
- Temperature
- ≈ 930 K (+657 °C)
- Found
- 2014, transit (Kepler)
Kepler-197
Kepler-197 d
- Year
- 15.68 days
- Distance from star
- 0.119 AU
- Mass
- 2 Earths
- Size
- 1.2 × Earth
- Temperature
- ≈ 810 K (+537 °C)
- Found
- 2014, transit (Kepler)
Kepler-197
Kepler-197 e
- Year
- 25.21 days
- Distance from star
- 0.164 AU
- Mass
- 0.69 Earths
- Size
- 0.91 × Earth
- Temperature
- ≈ 691 K (+418 °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.