The star
The star
Kepler-539
- Type
- G2 V
- Surface
- ≈ 5,820 K
- Size
- 0.95 × the Sun
- Mass
- 1.05 × the Sun
- Brightness
- 0.87 × the Sun
- Habitable zone
- 0.698–1.64 AU
The planets
Kepler-539
Kepler-539 b
- Year
- 125.63 days
- Distance from star
- 0.499 AU
- Mass
- 0.97 Jupiters
- Size
- 8.4 × Earth
- Temperature
- ≈ 388 K (+114 °C)
- Found
- 2016, transit (Kepler)
Kepler-539
Kepler-539 c
- Year
- 2.7 years
- Distance from star
- 2.42 AU
- Mass
- 2.4 Jupiters
- Size
- 13 × Earth
- Temperature
- ≈ 253 K (-20 °C)
- Found
- 2016, transit timing variations (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.
Early and late
A known planet arrives early or late for its transits, betraying the pull of another, unseen planet.
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.