The star
The star
Kepler-445
- Type
- M4
- Surface
- ≈ 3,157 K
- Size
- 0.21 × the Sun
- Mass
- 0.18 × the Sun
- Brightness
- 0.00794 × the Sun
- Habitable zone
- 0.0732–0.193 AU
The planets
Kepler-445
Kepler-445 b
- Year
- 2.98 days
- Distance from star
- 0.0217 AU
- Mass
- 3.1 Earths
- Size
- 1.6 × Earth
- Temperature
- ≈ 401 K (+128 °C)
- Found
- 2015, transit (Kepler)
Kepler-445
Kepler-445 c
- Year
- 4.87 days
- Distance from star
- 0.0301 AU
- Mass
- 6.8 Earths
- Size
- 2.5 × Earth
- Temperature
- ≈ 341 K (+68 °C)
- Found
- 2015, transit (Kepler)
Kepler-445
Kepler-445 d
- Year
- 8.15 days
- Distance from star
- 0.0439 AU
- Mass
- 2.1 Earths
- Size
- 1.2 × Earth
- Temperature
- ≈ 305 K (+32 °C)
- Found
- 2015, 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.