The star
The star
Kepler-1669
- Type
- orange dwarf
- Surface
- ≈ 4,303 K
- Size
- 0.71 × the Sun
- Mass
- 0.67 × the Sun
- Brightness
- 0.158 × the Sun
- Habitable zone
- 0.319–0.797 AU
The planets
Kepler-1669
Kepler-1669 c
- Year
- 1.61 days
- Distance from star
- 0.0228 AU
- Mass
- 4.3 Earths
- Size
- 1.9 × Earth
- Temperature
- ≈ 958 K (+685 °C)
- Found
- 2021, transit (Kepler)
Kepler-1669
Kepler-1669 d
- Year
- 4.73 days
- Distance from star
- 0.0468 AU
- Mass
- 2 Earths
- Size
- 1.2 × Earth
- Temperature
- ≈ 669 K (+396 °C)
- Found
- 2023, transit (Kepler)
Kepler-1669
Kepler-1669 b
- Year
- 9.51 days
- Distance from star
- 0.0745 AU
- Mass
- 8.2 Earths
- Size
- 2.8 × Earth
- Temperature
- ≈ 530 K (+257 °C)
- Found
- 2020, 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.