The star
The star
Kepler-289
- Type
- yellow star
- Surface
- ≈ 5,990 K
- Size
- 0.98 × the Sun
- Mass
- 1.06 × the Sun
- Brightness
- 1.15 × the Sun
- Habitable zone
- 0.795–1.86 AU
The planets
Kepler-289
Kepler-289 b
- Year
- 34.54 days
- Distance from star
- 0.212 AU
- Mass
- 3.7 Earths
- Size
- 2.5 × Earth
- Temperature
- ≈ 607 K (+334 °C)
- Found
- 2014, transit (Kepler)
Kepler-289
Kepler-289 d
- Year
- 66.03 days
- Distance from star
- 0.33 AU
- Mass
- 5.3 Earths
- Size
- 3 × Earth
- Temperature
- ≈ 503 K (+230 °C)
- Found
- 2014, transit (Kepler)
Kepler-289
Kepler-289 c
- Year
- 125.87 days
- Distance from star
- 0.502 AU
- Mass
- 1.6e+02 Earths
- Size
- 11 × Earth
- Temperature
- ≈ 394 K (+121 °C)
- Found
- 2014, transit (Kepler)
Kepler-289
Kepler-289 e
- Year
- 330.07 days
- Distance from star
- 0.934 AU
- Mass
- 17 Earths
- Size
- 2.9 × Earth
- Temperature
- ≈ 286 K (+13 °C)
- Found
- 2025, 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.