The star
The star
TOI-201
- Type
- F
- Surface
- ≈ 6,423 K
- Size
- 1.31 × the Sun
- Mass
- 1.32 × the Sun
- Brightness
- 2.61 × the Sun
- Habitable zone
- 1.17–2.71 AU
The planets
TOI-201
TOI-201 d
- Year
- 5.85 days
- Distance from star
- 0.0698 AU
- Mass
- 5.8 Earths
- Size
- 1.4 × Earth
- Temperature
- ≈ 1237 K (+964 °C)
- Found
- 2026, transit (Transiting Exoplanet Survey Satellite (TESS))
TOI-201
TOI-201 b
- Year
- 52.98 days
- Distance from star
- 0.303 AU
- Mass
- 1.6e+02 Earths
- Size
- 11 × Earth
- Temperature
- ≈ 759 K (+486 °C)
- Found
- 2021, transit (Transiting Exoplanet Survey Satellite (TESS))
TOI-201
TOI-201 c
- Year
- 7.9 years
- Distance from star
- 4.37 AU
- Mass
- 16 Jupiters
- Size
- 10 × Earth
- Temperature
- ≈ 170 K (-104 °C)
- Found
- 2025, transit timing variations (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.
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.