The star
The star
Kepler-305
- Type
- orange dwarf
- Surface
- ≈ 5,090 K
- Size
- 0.79 × the Sun
- Mass
- 0.83 × the Sun
- Brightness
- 0.377 × the Sun
- Habitable zone
- 0.479–1.15 AU
The planets
Kepler-305
Kepler-305 e
- Year
- 3.21 days
- Distance from star
- 0.0402 AU
- Mass
- 3.9 Earths
- Size
- 1.8 × Earth
- Temperature
- ≈ 1000 K (+727 °C)
- Found
- 2020, transit (Kepler)
Kepler-305
Kepler-305 b
- Year
- 5.49 days
- Distance from star
- 0.0575 AU
- Mass
- 10 Earths
- Size
- 3.6 × Earth
- Temperature
- ≈ 836 K (+563 °C)
- Found
- 2013, transit (Kepler)
Kepler-305
Kepler-305 c
- Year
- 8.29 days
- Distance from star
- 0.0757 AU
- Mass
- 6 Earths
- Size
- 3.3 × Earth
- Temperature
- ≈ 728 K (+455 °C)
- Found
- 2013, transit (Kepler)
Kepler-305
Kepler-305 d
- Year
- 16.74 days
- Distance from star
- 0.121 AU
- Mass
- 6.2 Earths
- Size
- 2.8 × Earth
- Temperature
- ≈ 576 K (+303 °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.