TOI-6434 b
TOI-6434 b is a Neptune-like planet orbiting TOI-6434 in the constellation Monoceros. It lies about 418 light-years from Earth and was discovered in 2026 using the transit method.
How Big Is TOI-6434 b?
TOI-6434 b has a radius of 4.61 times that of Earth.
Is TOI-6434 b in the Habitable Zone?
The position of TOI-6434 b relative to the habitable zone of TOI-6434 cannot be precisely determined from the available orbital data.
Habitable zone of TOI-6434: 0.253–0.642 AU (conservative: 0.321–0.609 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-6434 b — one full orbit around TOI-6434 — lasts 2.78 Earth days, shorter than Mercury's 88-day year.
How Was TOI-6434 b Discovered?
TOI-6434 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-6434 b?
TOI-6434 b is 417.5 light-years (128.0 parsecs) from Earth. Light arriving here tonight left the planet around the year 1609. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 7,348,000 years to make the journey.
The Host Star: TOI-6434
TOI-6434
- Surface temperature
- 3,982 K (Sun: 5,772 K)
- Mass
- 0.63 M☉
- Radius
- 0.66 R☉
- Luminosity
- 0.0975 L☉
Planetary System
TOI-6434 b is the only planet known to orbit TOI-6434 so far.
TOI-6434 b — Complete Data
| Radius | 4.610 Earth radii (0.411 Jupiter radii) |
|---|---|
| Orbital period | 2.78 days |
| Distance from Earth | 417.5 light-years (128.0 parsecs) |
| Constellation | Monoceros |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2026 |
Data: NASA Exoplanet Archive, last updated 2026-10-08. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-6434 b
Is TOI-6434 b habitable?
TOI-6434 b is not known to orbit within the habitable zone of TOI-6434, and as a Neptune-like planet it is an unlikely candidate for life as we know it.
How far away is TOI-6434 b?
TOI-6434 b is about 418 light-years from Earth in the constellation Monoceros. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 7,348,000 years to get there.
How big is TOI-6434 b compared to Earth?
TOI-6434 b has 4.61 times the radius of Earth.
How long is a year on TOI-6434 b?
One orbit around TOI-6434 takes 2.8 Earth days — short enough that 131 of its years would fit into one Earth year.
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