TOI-1174 b
TOI-1174 b is a mini-Neptune orbiting TOI-1174 in the constellation Draco. It lies about 309 light-years from Earth and was discovered in 2024 using the transit method.
How Big Is TOI-1174 b?
TOI-1174 b has a radius of 2.56 times that of Earth.
Is TOI-1174 b in the Habitable Zone?
TOI-1174 b orbits inside the inner edge of the habitable zone of TOI-1174. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-1174: 0.450–1.088 AU (conservative: 0.571–1.031 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-1174 b
TOI-1174 b receives 52.02 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-1174 b — one full orbit around TOI-1174 — lasts 8.95 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.080 AU — closer to its star than Mercury is to the Sun.
How Was TOI-1174 b Discovered?
TOI-1174 b was discovered in 2024 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-1174 b?
TOI-1174 b is 308.7 light-years (94.6 parsecs) from Earth. Light arriving here tonight left the planet around the year 1718. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 5,433,120 years to make the journey.
The Host Star: TOI-1174
TOI-1174
- Surface temperature
- 5,030 K (Sun: 5,772 K)
- Mass
- 0.85 M☉
- Radius
- 0.76 R☉
Planetary System
TOI-1174 b is the only planet known to orbit TOI-1174 so far.
TOI-1174 b — Complete Data
| Radius | 2.562 Earth radii (0.229 Jupiter radii) |
|---|---|
| Orbital period | 8.95 days |
| Orbital distance | 0.080 AU |
| Stellar irradiation | 52.02× Earth |
| Distance from Earth | 308.7 light-years (94.6 parsecs) |
| Constellation | Draco |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2024 |
Data: NASA Exoplanet Archive, last updated 2024-12-10. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-1174 b
Is TOI-1174 b habitable?
No — TOI-1174 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-1174 b?
TOI-1174 b is about 309 light-years from Earth in the constellation Draco. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 5,433,120 years to get there.
How big is TOI-1174 b compared to Earth?
TOI-1174 b has 2.56 times the radius of Earth.
How long is a year on TOI-1174 b?
One orbit around TOI-1174 takes 9.0 Earth days — short enough that 41 of its years would fit into one Earth year.
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