TOI-6729 c
TOI-6729 c is a sub-Neptune orbiting TOI-6729 in the constellation Hydrus. It lies about 608 light-years from Earth and was discovered in 2026 using the transit method.
How Big Is TOI-6729 c?
TOI-6729 c has a radius of 3.01 times that of Earth.
Is TOI-6729 c in the Habitable Zone?
The position of TOI-6729 c relative to the habitable zone of TOI-6729 cannot be precisely determined from the available orbital data.
Habitable zone of TOI-6729: 1.610–3.751 AU (conservative: 2.040–3.556 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-6729 c — one full orbit around TOI-6729 — lasts 7.84 Earth days, shorter than Mercury's 88-day year.
How Was TOI-6729 c Discovered?
TOI-6729 c 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-6729 c?
TOI-6729 c is 607.9 light-years (186.4 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 10,699,040 years to make the journey.
The Host Star: TOI-6729
TOI-6729
- Surface temperature
- 6,290 K (Sun: 5,772 K)
- Mass
- 1.23 M☉
- Radius
- 1.86 R☉
- Luminosity
- 4.9002 L☉
The TOI-6729 Planetary System
TOI-6729 c is one of 2 known planets in the TOI-6729 system. Its siblings:
- TOI-6729 b (Super Earth)
TOI-6729 c — Complete Data
| Radius | 3.010 Earth radii (0.269 Jupiter radii) |
|---|---|
| Orbital period | 7.84 days |
| Distance from Earth | 607.9 light-years (186.4 parsecs) |
| Constellation | Hydrus |
| 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-6729 c
Is TOI-6729 c habitable?
TOI-6729 c is not known to orbit within the habitable zone of TOI-6729, and as a sub-Neptune it is an unlikely candidate for life as we know it.
How far away is TOI-6729 c?
TOI-6729 c is about 608 light-years from Earth in the constellation Hydrus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 10,699,040 years to get there.
How big is TOI-6729 c compared to Earth?
TOI-6729 c has 3.01 times the radius of Earth.
How long is a year on TOI-6729 c?
One orbit around TOI-6729 takes 7.8 Earth days — short enough that 47 of its years would fit into one Earth year.
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