TOI-6109 c
TOI-6109 c is a Neptune-like planet orbiting the G3 star TOI-6109 in the constellation Perseus. It lies about 495 light-years from Earth and was discovered in 2025 using the transit method.
How Big Is TOI-6109 c?
TOI-6109 c has a radius of 4.83 times that of Earth.
Is TOI-6109 c in the Habitable Zone?
TOI-6109 c orbits inside the inner edge of the habitable zone of TOI-6109. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-6109: 0.710–1.678 AU (conservative: 0.899–1.591 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-6109 c — one full orbit around TOI-6109 — lasts 8.54 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.079 AU — closer to its star than Mercury is to the Sun.
How Was TOI-6109 c Discovered?
TOI-6109 c 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-6109 c?
TOI-6109 c is 494.9 light-years (151.7 parsecs) from Earth. Light arriving here tonight left the planet around the year 1532. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 8,710,240 years to make the journey.
The Host Star: TOI-6109
TOI-6109
- Spectral type
- G3
- Surface temperature
- 5,660 K (Sun: 5,772 K)
- Mass
- 1.03 M☉
- Radius
- 1.02 R☉
- Luminosity
- 0.8820 L☉
- Age
- 0.1 billion years (Sun: 4.6)
The TOI-6109 Planetary System
TOI-6109 c is one of 2 known planets in the TOI-6109 system. Its siblings:
- TOI-6109 b (Neptune-like)
TOI-6109 c — Complete Data
| Radius | 4.833 Earth radii (0.431 Jupiter radii) |
|---|---|
| Orbital period | 8.54 days |
| Orbital distance | 0.079 AU |
| Distance from Earth | 494.9 light-years (151.7 parsecs) |
| Constellation | Perseus |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2025 |
Data: NASA Exoplanet Archive, last updated 2025-10-09. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-6109 c
Is TOI-6109 c habitable?
No — TOI-6109 c orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-6109 c?
TOI-6109 c is about 495 light-years from Earth in the constellation Perseus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 8,710,240 years to get there.
How big is TOI-6109 c compared to Earth?
TOI-6109 c has 4.83 times the radius of Earth.
How long is a year on TOI-6109 c?
One orbit around TOI-6109 takes 8.5 Earth days — short enough that 43 of its years would fit into one Earth year.
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