The star
The star
Kepler-238
- Type
- yellow star
- Surface
- ≈ 5,751 K
- Size
- 1.43 × the Sun
- Mass
- 1.23 × the Sun
- Brightness
- 2.69 × the Sun
- Habitable zone
- 1.23–2.91 AU
The planets
Kepler-238
Kepler-238 b
- Year
- 2.09 days
- Distance from star
- 0.034 AU
- Mass
- 10 Jupiters
- Size
- 1.7 × Earth
- Temperature
- ≈ 1642 K (+1369 °C)
- Found
- 2014, transit (Kepler)
Kepler-238
Kepler-238 c
- Year
- 6.16 days
- Distance from star
- 0.069 AU
- Mass
- 1.5e+02 Earths
- Size
- 2.4 × Earth
- Temperature
- ≈ 1146 K (+873 °C)
- Found
- 2014, transit (Kepler)
Kepler-238
Kepler-238 d
- Year
- 13.23 days
- Distance from star
- 0.115 AU
- Mass
- 23 Earths
- Size
- 3.1 × Earth
- Temperature
- ≈ 888 K (+615 °C)
- Found
- 2014, transit (Kepler)
Kepler-238
Kepler-238 e
- Year
- 23.65 days
- Distance from star
- 0.173 AU
- Mass
- 1.7e+02 Earths
- Size
- 5.6 × Earth
- Temperature
- ≈ 731 K (+458 °C)
- Found
- 2013, transit (Kepler)
Kepler-238
Kepler-238 f
- Year
- 50.45 days
- Distance from star
- 0.286 AU
- Mass
- 14 Earths
- Size
- 2 × Earth
- Temperature
- ≈ 568 K (+295 °C)
- Found
- 2013, 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.