TOI-1774.01
TOI-1774.01 is a mini-Neptune orbiting TOI-1774 in the constellation Leo Minor. It lies about 176 light-years from Earth and was discovered in 2021 using the transit method.
How Big Is TOI-1774.01?
TOI-1774.01 has a radius of 2.78 times that of Earth. Its mass is 8.5 times that of Earth.
Is TOI-1774.01 in the Habitable Zone?
The position of TOI-1774.01 relative to the habitable zone of TOI-1774 cannot be precisely determined from the available orbital data.
Habitable zone of TOI-1774: 0.840–1.982 AU (conservative: 1.065–1.879 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 ›
Temperature on TOI-1774.01
The equilibrium temperature of TOI-1774.01 is about 824 K (551 °C) — hot enough to melt many metals. This estimate ignores any atmosphere, which could change surface temperatures dramatically — Earth's greenhouse effect adds about 33 °C.
Orbit and Year Length
A year on TOI-1774.01 — one full orbit around TOI-1774 — lasts 16.7 Earth days, shorter than Mercury's 88-day year. Its orbit is mildly elliptical (eccentricity 0.05).
How Was TOI-1774.01 Discovered?
TOI-1774.01 was discovered in 2021 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-1774.01?
TOI-1774.01 is 176.0 light-years (54.0 parsecs) from Earth. Light arriving here tonight left the planet around the year 1850. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 3,097,600 years to make the journey.
The Host Star: TOI-1774
TOI-1774
- Surface temperature
- 5,746 K (Sun: 5,772 K)
- Mass
- 0.99 M☉
- Radius
- 1.13 R☉
- Age
- 7.4 billion years (Sun: 4.6)
The TOI-1774 Planetary System
TOI-1774.01 is one of 2 known planets in the TOI-1774 system. Its siblings:
- HD 85426 c (Neptune-like)
TOI-1774.01 — Complete Data
| Radius | 2.780 Earth radii (0.248 Jupiter radii) |
|---|---|
| Mass (best estimate) | 8.50 Earth masses |
| Orbital period | 16.71 days |
| Eccentricity | 0.050 |
| Equilibrium temperature | 824 K (551 °C) |
| Distance from Earth | 176.0 light-years (54.0 parsecs) |
| Constellation | Leo Minor |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2021 |
Data: NASA Exoplanet Archive, last updated 2026-02-12. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-1774.01
Is TOI-1774.01 habitable?
TOI-1774.01 is not known to orbit within the habitable zone of TOI-1774, and as a mini-Neptune it is an unlikely candidate for life as we know it.
How far away is TOI-1774.01?
TOI-1774.01 is about 176 light-years from Earth in the constellation Leo Minor. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 3,097,600 years to get there.
How big is TOI-1774.01 compared to Earth?
TOI-1774.01 has 2.78 times the radius of Earth and about 8.5 times its mass.
How long is a year on TOI-1774.01?
One orbit around TOI-1774 takes 16.7 Earth days — short enough that 22 of its years would fit into one Earth year.
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