The star
The star
NGTS-39
- Type
- F9 V
- Surface
- ≈ 6,053 K
- Size
- 1.16 × the Sun
- Mass
- 1.16 × the Sun
- Brightness
- 1.58 × the Sun
- Habitable zone
- 0.928–2.17 AU
The planets
NGTS-39
NGTS-39 b
- Year
- 58.20 days
- Distance from star
- 0.308 AU
- Mass
- 1.5 Jupiters
- Size
- 12 × Earth
- Temperature
- ≈ 519 K (+246 °C)
- Found
- 2026, transit (Transiting Exoplanet Survey Satellite (TESS))
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.