The star
The star
Kepler-220
- Type
- orange dwarf
- Surface
- ≈ 4,632 K
- Size
- 0.67 × the Sun
- Mass
- 0.73 × the Sun
- Brightness
- 0.211 × the Sun
- Habitable zone
- 0.365–0.898 AU
The planets
Kepler-220
Kepler-220 b
- Year
- 4.16 days
- Distance from star
- 0.046 AU
- Mass
- 0.46 Earths
- Size
- 0.81 × Earth
- Temperature
- ≈ 759 K (+486 °C)
- Found
- 2014, transit (Kepler)
Kepler-220
Kepler-220 c
- Year
- 9.03 days
- Distance from star
- 0.076 AU
- Mass
- 3.1 Earths
- Size
- 1.6 × Earth
- Temperature
- ≈ 586 K (+313 °C)
- Found
- 2014, transit (Kepler)
Kepler-220
Kepler-220 d
- Year
- 28.12 days
- Distance from star
- 0.163 AU
- Mass
- 0.9 Earths
- Size
- 0.98 × Earth
- Temperature
- ≈ 401 K (+128 °C)
- Found
- 2014, transit (Kepler)
Kepler-220
Kepler-220 e
- Year
- 45.90 days
- Distance from star
- 0.226 AU
- Mass
- 2.3 Earths
- Size
- 1.3 × Earth
- Temperature
- ≈ 341 K (+68 °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.