TOI-1743 b
TOI-1743 b is a super-Earth orbiting the M4 V star TOI-1743 in the constellation Draco. It lies about 135 light-years from Earth and was discovered in 2025 using the transit method.
How Big Is TOI-1743 b?
TOI-1743 b has a radius of 1.83 times that of Earth.
Is TOI-1743 b in the Habitable Zone?
TOI-1743 b orbits inside the inner edge of the habitable zone of TOI-1743. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-1743: 0.089–0.234 AU (conservative: 0.113–0.222 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-1743 b
The equilibrium temperature of TOI-1743 b is about 485 K (212 °C) — hotter than anywhere on Earth. 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-1743 b — one full orbit around TOI-1743 — lasts 4.27 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.036 AU — closer to its star than Mercury is to the Sun.
How Was TOI-1743 b Discovered?
TOI-1743 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-1743 b?
TOI-1743 b is 134.6 light-years (41.3 parsecs) from Earth. Light arriving here tonight left the planet around the year 1892. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 2,368,960 years to make the journey.
The Host Star: TOI-1743
TOI-1743
- Spectral type
- M4 V
- Surface temperature
- 3,277 K (Sun: 5,772 K)
- Mass
- 0.34 M☉
- Radius
- 0.34 R☉
- Age
- 9.7 billion years (Sun: 4.6)
Planetary System
TOI-1743 b is the only planet known to orbit TOI-1743 so far.
TOI-1743 b — Complete Data
| Radius | 1.830 Earth radii (0.163 Jupiter radii) |
|---|---|
| Orbital period | 4.27 days |
| Orbital distance | 0.036 AU |
| Equilibrium temperature | 485 K (212 °C) |
| Distance from Earth | 134.6 light-years (41.3 parsecs) |
| Constellation | Draco |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2025 |
Data: NASA Exoplanet Archive, last updated 2025-10-02. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-1743 b
Is TOI-1743 b habitable?
No — TOI-1743 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-1743 b?
TOI-1743 b is about 135 light-years from Earth in the constellation Draco. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 2,368,960 years to get there.
How big is TOI-1743 b compared to Earth?
TOI-1743 b has 1.83 times the radius of Earth.
How long is a year on TOI-1743 b?
One orbit around TOI-1743 takes 4.3 Earth days — short enough that 86 of its years would fit into one Earth year.
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