TOI-1346 b
TOI-1346 b is a mini-Neptune orbiting TOI-1346 in the constellation Draco. It lies about 377 light-years from Earth and was discovered in 2025 using the transit method.
How Big Is TOI-1346 b?
TOI-1346 b has a radius of 2.39 times that of Earth.
Is TOI-1346 b in the Habitable Zone?
The position of TOI-1346 b relative to the habitable zone of TOI-1346 cannot be precisely determined from the available orbital data.
Habitable zone of TOI-1346: 0.473–1.140 AU (conservative: 0.600–1.081 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-1346 b
The equilibrium temperature of TOI-1346 b is about 1,324 K (1,051 °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-1346 b — one full orbit around TOI-1346 — lasts just 42.3 hours, shorter than Mercury's 88-day year.
How Was TOI-1346 b Discovered?
TOI-1346 b was discovered in 2025 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-1346 b?
TOI-1346 b is 376.5 light-years (115.5 parsecs) from Earth. Light arriving here tonight left the planet around the year 1650. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 6,626,400 years to make the journey.
The Host Star: TOI-1346
TOI-1346
- Surface temperature
- 5,099 K (Sun: 5,772 K)
- Mass
- 0.82 M☉
- Radius
- 0.78 R☉
The TOI-1346 Planetary System
TOI-1346 b is one of 2 known planets in the TOI-1346 system. Its siblings:
- TOI-1346 c (Mini Neptune)
TOI-1346 b — Complete Data
| Radius | 2.390 Earth radii (0.213 Jupiter radii) |
|---|---|
| Orbital period | 1.76 days |
| Equilibrium temperature | 1,324 K (1,051 °C) |
| Distance from Earth | 376.5 light-years (115.5 parsecs) |
| Constellation | Draco |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2025 |
Data: NASA Exoplanet Archive, last updated 2025-08-14. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-1346 b
Is TOI-1346 b habitable?
TOI-1346 b is not known to orbit within the habitable zone of TOI-1346, and as a mini-Neptune it is an unlikely candidate for life as we know it.
How far away is TOI-1346 b?
TOI-1346 b is about 377 light-years from Earth in the constellation Draco. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 6,626,400 years to get there.
How big is TOI-1346 b compared to Earth?
TOI-1346 b has 2.39 times the radius of Earth.
How long is a year on TOI-1346 b?
One orbit around TOI-1346 takes 1.8 Earth days — short enough that 207 of its years would fit into one Earth year.
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