TOI-880 c
TOI-880 c is a Neptune-like planet orbiting the K star TOI-880 in the constellation Canis Major. It lies about 198 light-years from Earth and was discovered in 2025 using the transit method.
How Big Is TOI-880 c?
TOI-880 c has a radius of 4.95 times that of Earth.
Is TOI-880 c in the Habitable Zone?
TOI-880 c orbits inside the inner edge of the habitable zone of TOI-880. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-880: 0.495–1.195 AU (conservative: 0.628–1.133 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-880 c
The equilibrium temperature of TOI-880 c is about 805 K (532 °C) — hot enough to melt many metals. This estimate ignores any atmosphere, which could change surface temperatures dramatically — Earth's greenhouse effect adds about 33 °C.
Orbit and Year Length
A year on TOI-880 c — one full orbit around TOI-880 — lasts 6.39 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.064 AU — closer to its star than Mercury is to the Sun.
How Was TOI-880 c Discovered?
TOI-880 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-880 c?
TOI-880 c is 197.9 light-years (60.7 parsecs) from Earth. Light arriving here tonight left the planet around the year 1829. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 3,483,040 years to make the journey.
The Host Star: TOI-880
TOI-880
- Spectral type
- K
- Surface temperature
- 5,050 K (Sun: 5,772 K)
- Mass
- 0.87 M☉
- Radius
- 0.83 R☉
- Age
- 5.2 billion years (Sun: 4.6)
The TOI-880 Planetary System
TOI-880 c is one of 2 known planets in the TOI-880 system. Its siblings:
- TOI-880.02 (Mini Neptune)
TOI-880 c — Complete Data
| Radius | 4.950 Earth radii (0.442 Jupiter radii) |
|---|---|
| Orbital period | 6.39 days |
| Orbital distance | 0.064 AU |
| Equilibrium temperature | 805 K (532 °C) |
| Distance from Earth | 197.9 light-years (60.7 parsecs) |
| Constellation | Canis Major |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2025 |
Data: NASA Exoplanet Archive, last updated 2025-08-28. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-880 c
Is TOI-880 c habitable?
No — TOI-880 c orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-880 c?
TOI-880 c is about 198 light-years from Earth in the constellation Canis Major. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 3,483,040 years to get there.
How big is TOI-880 c compared to Earth?
TOI-880 c has 4.95 times the radius of Earth.
How long is a year on TOI-880 c?
One orbit around TOI-880 takes 6.4 Earth days — short enough that 57 of its years would fit into one Earth year.
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