The star
The star
Kepler-522
- Type
- white star
- Surface
- ≈ 6,392 K
- Size
- 1.98 × the Sun
- Mass
- 1.54 × the Sun
- Brightness
- 4.51 × the Sun
- Habitable zone
- 1.54–3.57 AU
The planets
Kepler-522
Kepler-522 b
- Year
- 38.58 days
- Distance from star
- 0.25 AU
- Mass
- 38 Earths
- Size
- 6.9 × Earth
- Temperature
- ≈ 761 K (+488 °C)
- Found
- 2016, 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.