The star
The star
Kepler-357
- Type
- orange dwarf
- Surface
- ≈ 5,036 K
- Size
- 0.83 × the Sun
- Mass
- 0.79 × the Sun
- Brightness
- 0.278 × the Sun
- Habitable zone
- 0.412–0.995 AU
The planets
Kepler-357
Kepler-357 b
- Year
- 6.48 days
- Distance from star
- 0.063 AU
- Mass
- 4 Earths
- Size
- 1.8 × Earth
- Temperature
- ≈ 793 K (+520 °C)
- Found
- 2014, transit (Kepler)
Kepler-357
Kepler-357 c
- Year
- 16.86 days
- Distance from star
- 0.12 AU
- Mass
- 7.6 Earths
- Size
- 2.7 × Earth
- Temperature
- ≈ 576 K (+303 °C)
- Found
- 2014, transit (Kepler)
Kepler-357
Kepler-357 d
- Year
- 49.50 days
- Distance from star
- 0.246 AU
- Mass
- 12 Earths
- Size
- 3.4 × Earth
- Temperature
- ≈ 402 K (+129 °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.