TOI-6393 b
TOI-6393 b is a mini-Neptune orbiting TOI-6393 in the constellation Ursa Major. It lies about 607 light-years from Earth and was discovered in 2026 using the transit method.
How Big Is TOI-6393 b?
TOI-6393 b has a radius of 2.76 times that of Earth.
Is TOI-6393 b in the Habitable Zone?
The position of TOI-6393 b relative to the habitable zone of TOI-6393 cannot be precisely determined from the available orbital data.
Habitable zone of TOI-6393: 0.451–1.089 AU (conservative: 0.571–1.033 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-6393 b — one full orbit around TOI-6393 — lasts 9.53 Earth days, shorter than Mercury's 88-day year.
How Was TOI-6393 b Discovered?
TOI-6393 b 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-6393 b?
TOI-6393 b is 607.4 light-years (186.2 parsecs) from Earth. Light arriving here tonight left the planet around the year 1419. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 10,690,240 years to make the journey.
The Host Star: TOI-6393
TOI-6393
- Surface temperature
- 5,008 K (Sun: 5,772 K)
- Radius
- 0.77 R☉
Planetary System
TOI-6393 b is the only planet known to orbit TOI-6393 so far.
TOI-6393 b — Complete Data
| Radius | 2.760 Earth radii (0.246 Jupiter radii) |
|---|---|
| Orbital period | 9.53 days |
| Distance from Earth | 607.4 light-years (186.2 parsecs) |
| Constellation | Ursa Major |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2026 |
Data: NASA Exoplanet Archive, last updated 2026-04-23. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-6393 b
Is TOI-6393 b habitable?
TOI-6393 b is not known to orbit within the habitable zone of TOI-6393, and as a mini-Neptune it is an unlikely candidate for life as we know it.
How far away is TOI-6393 b?
TOI-6393 b is about 607 light-years from Earth in the constellation Ursa Major. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 10,690,240 years to get there.
How big is TOI-6393 b compared to Earth?
TOI-6393 b has 2.76 times the radius of Earth.
How long is a year on TOI-6393 b?
One orbit around TOI-6393 takes 9.5 Earth days — short enough that 38 of its years would fit into one Earth year.
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