The star
The star
Kepler-1889
- Type
- yellow star
- Surface
- ≈ 5,646 K
- Size
- 0.82 × the Sun
- Mass
- 0.86 × the Sun
- Brightness
- 1.66 × the Sun
- Habitable zone
- 0.974–2.3 AU
The planets
Kepler-1889
Kepler-1889 b
- Year
- 37.30 days
- Distance from star
- 0.208 AU
- Mass
- 9 Earths
- Size
- 2.9 × Earth
- Temperature
- ≈ 493 K (+220 °C)
- Found
- 2021, 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.