The star
The star
Kepler-223
- Type
- yellow star
- Surface
- ≈ 5,803 K
- Size
- 1.72 × the Sun
- Mass
- 1.12 × the Sun
- Brightness
- 2.35 × the Sun
- Habitable zone
- 1.15–2.71 AU
The planets
Kepler-223
Kepler-223 b
- Year
- 7.38 days
- Distance from star
- 0.0752 AU
- Mass
- 7.4 Earths
- Size
- 3 × Earth
- Temperature
- ≈ 1042 K (+769 °C)
- Found
- 2014, transit (Kepler)
Kepler-223
Kepler-223 c
- Year
- 9.85 days
- Distance from star
- 0.0912 AU
- Mass
- 5.1 Earths
- Size
- 3.4 × Earth
- Temperature
- ≈ 947 K (+674 °C)
- Found
- 2014, transit (Kepler)
Kepler-223
Kepler-223 d
- Year
- 14.79 days
- Distance from star
- 0.12 AU
- Mass
- 8 Earths
- Size
- 5.2 × Earth
- Temperature
- ≈ 827 K (+554 °C)
- Found
- 2014, transit (Kepler)
Kepler-223
Kepler-223 e
- Year
- 19.73 days
- Distance from star
- 0.145 AU
- Mass
- 4.8 Earths
- Size
- 4.6 × Earth
- Temperature
- ≈ 751 K (+478 °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.