The star
The star
K2-63
- Type
- white star
- Surface
- ≈ 6,771 K
- Size
- 1.63 × the Sun
- Mass
- 1.40 × the Sun
- Brightness
- 1.66 × the Sun
- Habitable zone
- 0.911–2.11 AU
The planets
K2-63
K2-63 b
- Year
- 20.26 days
- Distance from star
- 0.163 AU
- Mass
- 10 Earths
- Size
- 3.2 × Earth
- Temperature
- ≈ 1033 K (+760 °C)
- Found
- 2016, transit (K2)
K2-63
K2-63 c
- Year
- 25.46 days
- Distance from star
- 0.189 AU
- Mass
- 14 Earths
- Size
- 3.9 × Earth
- Temperature
- ≈ 959 K (+686 °C)
- Found
- 2016, transit (K2)
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.