The star
The star
Kepler-647
- Type
- white star
- Surface
- ≈ 6,020 K
- Size
- 1.07 × the Sun
- Mass
- 1.03 × the Sun
- Brightness
- 2.62 × the Sun
- Habitable zone
- 1.2–2.8 AU
The planets
Kepler-647
Kepler-647 b
- Year
- 16.23 days
- Distance from star
- 0.122 AU
- Mass
- 1.7 Earths
- Size
- 1.2 × Earth
- Temperature
- ≈ 788 K (+515 °C)
- Found
- 2016, transit (Kepler)
Kepler-647
Kepler-647 c
- Year
- 29.67 days
- Distance from star
- 0.183 AU
- Mass
- 15 Earths
- Size
- 4 × Earth
- Temperature
- ≈ 644 K (+371 °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.