The star
The star
KELT-20
- Type
- A2 V
- Surface
- ≈ 8,720 K
- Size
- 1.56 × the Sun
- Mass
- 1.76 × the Sun
- Brightness
- 12.7 × the Sun
- Habitable zone
- 3.39–5.95 AU
The planets
KELT-20
KELT-20 b
- Year
- 3.47 days
- Distance from star
- 0.0542 AU
- Mass
- 3.4 Jupiters
- Size
- 20 × Earth
- Temperature
- ≈ 2262 K (+1989 °C)
- Found
- 2017, transit (KELT-North)
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.