The star
The star
Kepler-1489
- Type
- G
- Surface
- ≈ 5,655 K
- Size
- 0.90 × the Sun
- Mass
- 0.93 × the Sun
- Brightness
- 1.58 × the Sun
- Habitable zone
- 0.949–2.24 AU
The planets
Kepler-1489
Kepler-1489 b
- Year
- 82.29 days
- Distance from star
- 0.368 AU
- Mass
- 3.8 Earths
- Size
- 1.8 × Earth
- Temperature
- ≈ 400 K (+127 °C)
- Found
- 2016, transit (Kepler)
Kepler-1489
Kepler-1489 c
- Year
- 0.68 days
- Distance from star
- 0.0148 AU
- Mass
- 0.087 Earths
- Size
- 0.51 × Earth
- Found
- 2024, 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.