The star
The star
TOI-1806
- Type
- red dwarf
- Surface
- ≈ 3,272 K
- Size
- 0.40 × the Sun
- Mass
- 0.39 × the Sun
- Brightness
- 0.0167 × the Sun
- Habitable zone
- 0.106–0.278 AU
The planets
TOI-1806
TOI-1806.01
- Year
- 15.15 days
- Distance from star
- 0.0877 AU
- Mass
- 12 Earths
- Size
- 3.4 × Earth
- Temperature
- ≈ 337 K (+64 °C)
- Found
- 2024, transit (Transiting Exoplanet Survey Satellite (TESS))
TOI-1806
TOI-1806 c
- Year
- 0.50 days
- Distance from star
- 0.00906 AU
- Mass
- 2.3 Earths
- Size
- 1.3 × Earth
- Temperature
- ≈ 961 K (+688 °C)
- Found
- 2026, transit (Transiting Exoplanet Survey Satellite (TESS))
TOI-1806
TOI-1806 d
- Year
- 8.20 days
- Distance from star
- 0.0583 AU
- Mass
- 8.7 Earths
- Size
- 2.9 × Earth
- Temperature
- ≈ 379 K (+106 °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.