TOI-4578 b
TOI-4578 b is a mini-Neptune orbiting TOI-4578 in the constellation Draco. It lies about 594 light-years from Earth and was discovered in 2026 using the transit method.
How Big Is TOI-4578 b?
TOI-4578 b has a radius of 2.27 times that of Earth.
Is TOI-4578 b in the Habitable Zone?
The position of TOI-4578 b relative to the habitable zone of TOI-4578 cannot be precisely determined from the available orbital data.
Habitable zone of TOI-4578: 0.692–1.624 AU (conservative: 0.877–1.540 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-4578 b — one full orbit around TOI-4578 — lasts 8.62 Earth days, shorter than Mercury's 88-day year.
How Was TOI-4578 b Discovered?
TOI-4578 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-4578 b?
TOI-4578 b is 594.4 light-years (182.2 parsecs) from Earth. Light arriving here tonight left the planet around the year 1432. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 10,461,440 years to make the journey.
The Host Star: TOI-4578
TOI-4578
- Surface temperature
- 5,951 K (Sun: 5,772 K)
- Radius
- 0.88 R☉
Planetary System
TOI-4578 b is the only planet known to orbit TOI-4578 so far.
TOI-4578 b — Complete Data
| Radius | 2.270 Earth radii (0.202 Jupiter radii) |
|---|---|
| Orbital period | 8.62 days |
| Distance from Earth | 594.4 light-years (182.2 parsecs) |
| Constellation | Draco |
| 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-4578 b
Is TOI-4578 b habitable?
TOI-4578 b is not known to orbit within the habitable zone of TOI-4578, and as a mini-Neptune it is an unlikely candidate for life as we know it.
How far away is TOI-4578 b?
TOI-4578 b is about 594 light-years from Earth in the constellation Draco. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 10,461,440 years to get there.
How big is TOI-4578 b compared to Earth?
TOI-4578 b has 2.27 times the radius of Earth.
How long is a year on TOI-4578 b?
One orbit around TOI-4578 takes 8.6 Earth days — short enough that 42 of its years would fit into one Earth year.
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