The star
The star
Kepler-37
- Type
- yellow star
- Surface
- ≈ 5,357 K
- Size
- 0.79 × the Sun
- Mass
- 0.79 × the Sun
- Brightness
- 0.477 × the Sun
- Habitable zone
- 0.531–1.27 AU
The planets
Kepler-37
Kepler-37 b
- Year
- 13.37 days
- Distance from star
- 0.102 AU
- Mass
- 0.79 Earths
- Size
- 0.31 × Earth
- Temperature
- ≈ 718 K (+445 °C)
- Found
- 2013, transit (Kepler)
Kepler-37
Kepler-37 c
- Year
- 21.30 days
- Distance from star
- 0.139 AU
- Mass
- 1.3 Earths
- Size
- 0.76 × Earth
- Temperature
- ≈ 615 K (+342 °C)
- Found
- 2013, transit (Kepler)
Kepler-37
Kepler-37 d
- Year
- 39.79 days
- Distance from star
- 0.211 AU
- Mass
- 2 Earths
- Size
- 2 × Earth
- Temperature
- ≈ 499 K (+226 °C)
- Found
- 2013, transit (Kepler)
Kepler-37
Kepler-37 e
- Year
- 51.20 days
- Distance from star
- 0.25 AU
- Mass
- at least 8.1 Earths
- Size
- 0.37 × Earth
- Temperature
- ≈ 401 K (+128 °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.