TOI-756 c
TOI-756 c is a cold gas giant orbiting the M1 V star TOI-756 in the constellation Centaurus. It lies about 281 light-years from Earth and was discovered in 2025 using the radial velocity method.
Is TOI-756 c in the Habitable Zone?
TOI-756 c orbits beyond the outer edge of the habitable zone of TOI-756. At that distance, any surface water would almost certainly be frozen.
Habitable zone of TOI-756: 0.165–0.426 AU (conservative: 0.209–0.403 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 ›
Temperature on TOI-756 c
The equilibrium temperature of TOI-756 c is about 194 K (-79 °C) — well below freezing. This estimate ignores any atmosphere, which could change surface temperatures dramatically — Earth's greenhouse effect adds about 33 °C. It receives 0.24 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-756 c — one full orbit around TOI-756 — lasts 149.4 Earth days, between the years of Mercury (88 days) and Earth (365 days). It orbits at an average distance of 0.439 AU — comparable to the inner Solar System. Its orbit is highly elliptical (eccentricity 0.45), swinging dramatically closer to and farther from its star.
How Was TOI-756 c Discovered?
TOI-756 c was discovered in 2025 using the radial velocity method, with observations from La Silla Observatory.
The radial velocity method measures the subtle wobble of a star caused by the gravitational pull of an orbiting planet, visible as periodic shifts in the star's light spectrum. The size of the wobble reveals the planet's minimum mass.
How Far Away Is TOI-756 c?
TOI-756 c is 281.1 light-years (86.2 parsecs) from Earth. Light arriving here tonight left the planet around the year 1745. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 4,947,360 years to make the journey.
The Host Star: TOI-756
TOI-756
- Spectral type
- M1 V
- Surface temperature
- 3,657 K (Sun: 5,772 K)
- Mass
- 0.51 M☉
- Radius
- 0.51 R☉
- Luminosity
- 0.0410 L☉
- Age
- 3.2 billion years (Sun: 4.6)
The TOI-756 Planetary System
TOI-756 c is one of 2 known planets in the TOI-756 system. Its siblings:
- TOI-756 b (Mini Neptune)
TOI-756 c — Complete Data
| Mass (best estimate) | 1,287.21 Earth masses |
|---|---|
| Orbital period | 149.40 days |
| Orbital distance | 0.439 AU |
| Eccentricity | 0.445 |
| Equilibrium temperature | 194 K (-79 °C) |
| Stellar irradiation | 0.24× Earth |
| Distance from Earth | 281.1 light-years (86.2 parsecs) |
| Constellation | Centaurus |
| Discovery method | Radial Velocity |
| Discovery facility | La Silla Observatory |
| Discovery year | 2025 |
Data: NASA Exoplanet Archive, last updated 2025-11-13. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-756 c
Is TOI-756 c habitable?
No — TOI-756 c orbits outside the habitable zone of TOI-756 and is likely too cold for liquid water on its surface.
How far away is TOI-756 c?
TOI-756 c is about 281 light-years from Earth in the constellation Centaurus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 4,947,360 years to get there.
How long is a year on TOI-756 c?
One orbit around TOI-756 takes 149.4 Earth days.
Explore TOI-756 c in the app
Browse, filter and compare 6,000+ exoplanets on iPhone, iPad and Apple Watch — with habitable-zone views, widgets and offline data.
