TOI-1260 c
TOI-1260 c is a super-Earth orbiting TOI-1260 in the constellation Ursa Major. It lies about 240 light-years from Earth and was discovered in 2021 using the transit method.
How Big Is TOI-1260 c?
TOI-1260 c has a radius of 2.76 times that of Earth. Its mass is 13.2 times that of Earth, giving it a density of 3.45 g/cm³ — between that of rocky and gaseous planets.
Is TOI-1260 c in the Habitable Zone?
TOI-1260 c orbits inside the inner edge of the habitable zone of TOI-1260. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-1260: 0.290–0.725 AU (conservative: 0.367–0.687 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-1260 c
The equilibrium temperature of TOI-1260 c is about 651 K (378 °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. It receives 29.81 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-1260 c — one full orbit around TOI-1260 — lasts 7.49 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.066 AU — closer to its star than Mercury is to the Sun.
How Was TOI-1260 c Discovered?
TOI-1260 c was discovered in 2021 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-1260 c?
TOI-1260 c is 240.0 light-years (73.6 parsecs) from Earth. Light arriving here tonight left the planet around the year 1786. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 4,224,000 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-1260 c scores 0.26, ranking #2,854 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TOI-1260
TOI-1260
- Surface temperature
- 4,227 K (Sun: 5,772 K)
- Mass
- 0.68 M☉
- Radius
- 0.67 R☉
- Luminosity
- 0.1290 L☉
- Age
- 6.7 billion years (Sun: 4.6)
The TOI-1260 Planetary System
TOI-1260 c is one of 3 known planets in the TOI-1260 system. Its siblings:
- TOI-1260 b (Super Earth)
- TOI-1260 d (Sub Neptune)
TOI-1260 c — Complete Data
| Radius | 2.760 Earth radii (0.246 Jupiter radii) |
|---|---|
| Mass | 13.20 Earth masses (0.042 Jupiter masses) |
| Density | 3.45 g/cm³ (Earth: 5.51) |
| Orbital period | 7.49 days |
| Orbital distance | 0.066 AU |
| Equilibrium temperature | 651 K (378 °C) |
| Stellar irradiation | 29.81× Earth |
| Earth Similarity Index | 0.26 |
| Distance from Earth | 240.0 light-years (73.6 parsecs) |
| Constellation | Ursa Major |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2021 |
Data: NASA Exoplanet Archive, last updated 2022-12-17. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-1260 c
Is TOI-1260 c habitable?
No — TOI-1260 c orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-1260 c?
TOI-1260 c is about 240 light-years from Earth in the constellation Ursa Major. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 4,224,000 years to get there.
How big is TOI-1260 c compared to Earth?
TOI-1260 c has 2.76 times the radius of Earth and about 13.2 times its mass.
How long is a year on TOI-1260 c?
One orbit around TOI-1260 takes 7.5 Earth days — short enough that 49 of its years would fit into one Earth year.
Explore TOI-1260 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.
