TOI-4405 b
TOI-4405 b is a mini-Neptune orbiting TOI-4405 in the constellation Mensa. It lies about 507 light-years from Earth and was discovered in 2026 using the transit method.
How Big Is TOI-4405 b?
TOI-4405 b has a radius of 2.56 times that of Earth.
Is TOI-4405 b in the Habitable Zone?
The position of TOI-4405 b relative to the habitable zone of TOI-4405 cannot be precisely determined from the available orbital data.
Habitable zone of TOI-4405: 0.329–0.814 AU (conservative: 0.416–0.771 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-4405 b — one full orbit around TOI-4405 — lasts 5.92 Earth days, shorter than Mercury's 88-day year.
How Was TOI-4405 b Discovered?
TOI-4405 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-4405 b?
TOI-4405 b is 507.2 light-years (155.5 parsecs) from Earth. Light arriving here tonight left the planet around the year 1519. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 8,926,720 years to make the journey.
The Host Star: TOI-4405
TOI-4405
- Surface temperature
- 4,467 K (Sun: 5,772 K)
- Radius
- 0.69 R☉
Planetary System
TOI-4405 b is the only planet known to orbit TOI-4405 so far.
TOI-4405 b — Complete Data
| Radius | 2.555 Earth radii (0.228 Jupiter radii) |
|---|---|
| Orbital period | 5.92 days |
| Distance from Earth | 507.2 light-years (155.5 parsecs) |
| Constellation | Mensa |
| 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-4405 b
Is TOI-4405 b habitable?
TOI-4405 b is not known to orbit within the habitable zone of TOI-4405, and as a mini-Neptune it is an unlikely candidate for life as we know it.
How far away is TOI-4405 b?
TOI-4405 b is about 507 light-years from Earth in the constellation Mensa. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 8,926,720 years to get there.
How big is TOI-4405 b compared to Earth?
TOI-4405 b has 2.56 times the radius of Earth.
How long is a year on TOI-4405 b?
One orbit around TOI-4405 takes 5.9 Earth days — short enough that 62 of its years would fit into one Earth year.
Explore TOI-4405 b in the app
Browse, filter and compare 6,000+ exoplanets on iPhone, iPad and Apple Watch — with habitable-zone views, widgets and offline data.
