TOI-1806 d
TOI-1806 d is a mini-Neptune orbiting TOI-1806 in the constellation Leo Minor. It lies about 181 light-years from Earth and was discovered in 2026 using the transit method.
How Big Is TOI-1806 d?
TOI-1806 d has a radius of 2.88 times that of Earth.
Is TOI-1806 d in the Habitable Zone?
The position of TOI-1806 d relative to the habitable zone of TOI-1806 cannot be precisely determined from the available orbital data.
Habitable zone of TOI-1806: 0.106–0.278 AU (conservative: 0.134–0.263 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
See the full interactive habitable-zone view in the Exoplanet Explorer app ›
Orbit and Year Length
A year on TOI-1806 d — one full orbit around TOI-1806 — lasts 8.20 Earth days, shorter than Mercury's 88-day year.
How Was TOI-1806 d Discovered?
TOI-1806 d was discovered in 2026 using the transit method, with observations from Transiting Exoplanet Survey Satellite (TESS).
The transit method watches a star for the tiny, regular dip in brightness that occurs when a planet crosses in front of it. The depth and timing of these dips reveal the planet's size and orbital period.
How Far Away Is TOI-1806 d?
TOI-1806 d is 181.1 light-years (55.5 parsecs) from Earth. Light arriving here tonight left the planet around the year 1845. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 3,187,360 years to make the journey.
The Host Star: TOI-1806
TOI-1806
- Surface temperature
- 3,272 K (Sun: 5,772 K)
- Mass
- 0.39 M☉
- Radius
- 0.40 R☉
- Luminosity
- 0.0167 L☉
The TOI-1806 Planetary System
TOI-1806 d is one of 3 known planets in the TOI-1806 system. Its siblings:
- TOI-1806 c (Super Earth)
- TOI-1806.01 (Sub Neptune)
TOI-1806 d — Complete Data
| Radius | 2.880 Earth radii (0.257 Jupiter radii) |
|---|---|
| Orbital period | 8.20 days |
| Distance from Earth | 181.1 light-years (55.5 parsecs) |
| Constellation | Leo Minor |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2026 |
Data: NASA Exoplanet Archive, last updated 2026-10-08. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-1806 d
Is TOI-1806 d habitable?
TOI-1806 d is not known to orbit within the habitable zone of TOI-1806, and as a mini-Neptune it is an unlikely candidate for life as we know it.
How far away is TOI-1806 d?
TOI-1806 d is about 181 light-years from Earth in the constellation Leo Minor. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 3,187,360 years to get there.
How big is TOI-1806 d compared to Earth?
TOI-1806 d has 2.88 times the radius of Earth.
How long is a year on TOI-1806 d?
One orbit around TOI-1806 takes 8.2 Earth days — short enough that 45 of its years would fit into one Earth year.
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