TOI-763 c
TOI-763 c is a mini-Neptune orbiting the G star TOI-763 in the constellation Centaurus. It lies about 310 light-years from Earth and was discovered in 2020 using the transit method.
How Big Is TOI-763 c?
TOI-763 c has a radius of 2.63 times that of Earth. Its mass is 9.3 times that of Earth, giving it a density of 2.82 g/cm³ — between that of rocky and gaseous planets.
Is TOI-763 c in the Habitable Zone?
TOI-763 c orbits inside the inner edge of the habitable zone of TOI-763. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-763: 0.611–1.452 AU (conservative: 0.773–1.377 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-763 c
The equilibrium temperature of TOI-763 c is about 800 K (527 °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-763 c — one full orbit around TOI-763 — lasts 12.3 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.101 AU — closer to its star than Mercury is to the Sun. Its orbit is nearly circular (eccentricity 0.040).
How Was TOI-763 c Discovered?
TOI-763 c was discovered in 2020 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-763 c?
TOI-763 c is 310.3 light-years (95.1 parsecs) from Earth. Light arriving here tonight left the planet around the year 1716. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 5,461,280 years to make the journey.
Earth Similarity Index
The Earth Similarity Index (ESI) scores how physically similar a planet is to Earth, from 0 to 1, based on radius, density, escape velocity and surface temperature. TOI-763 c scores 0.24, ranking #3,247 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TOI-763
TOI-763
- Spectral type
- G
- Surface temperature
- 5,450 K (Sun: 5,772 K)
- Mass
- 0.92 M☉
- Radius
- 0.90 R☉
The TOI-763 Planetary System
TOI-763 c is one of 2 known planets in the TOI-763 system. Its siblings:
- TOI-763 b (Super Earth)
TOI-763 c — Complete Data
| Radius | 2.630 Earth radii (0.235 Jupiter radii) |
|---|---|
| Mass | 9.32 Earth masses (0.029 Jupiter masses) |
| Density | 2.82 g/cm³ (Earth: 5.51) |
| Orbital period | 12.27 days |
| Orbital distance | 0.101 AU |
| Eccentricity | 0.040 |
| Equilibrium temperature | 800 K (527 °C) |
| Earth Similarity Index | 0.24 |
| Distance from Earth | 310.3 light-years (95.1 parsecs) |
| Constellation | Centaurus |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2020 |
Data: NASA Exoplanet Archive, last updated 2020-09-17. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-763 c
Is TOI-763 c habitable?
No — TOI-763 c orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-763 c?
TOI-763 c is about 310 light-years from Earth in the constellation Centaurus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 5,461,280 years to get there.
How big is TOI-763 c compared to Earth?
TOI-763 c has 2.63 times the radius of Earth and about 9.3 times its mass.
How long is a year on TOI-763 c?
One orbit around TOI-763 takes 12.3 Earth days — short enough that 30 of its years would fit into one Earth year.
Explore TOI-763 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.
