TOI-2876 b
TOI-2876 b is a hot Jupiter orbiting TOI-2876 in the constellation Canis Major. It lies about 736 light-years from Earth and was discovered in 2025 using the transit method.
How Big Is TOI-2876 b?
TOI-2876 b has a radius of 9.64 times that of Earth, or 0.86 times the radius of Jupiter. Its mass is 54.0 times that of Earth, giving it a density of 0.33 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is TOI-2876 b in the Habitable Zone?
TOI-2876 b orbits inside the inner edge of the habitable zone of TOI-2876. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-2876: 0.562–1.345 AU (conservative: 0.712–1.275 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-2876 b
The equilibrium temperature of TOI-2876 b is about 929 K (656 °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 124 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-2876 b — one full orbit around TOI-2876 — lasts 6.30 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.065 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.13).
How Was TOI-2876 b Discovered?
TOI-2876 b 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-2876 b?
TOI-2876 b is 736.3 light-years (225.7 parsecs) from Earth. Light arriving here tonight left the planet around the year 1290. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 12,958,880 years to make the journey.
The Host Star: TOI-2876
TOI-2876
- Surface temperature
- 5,271 K (Sun: 5,772 K)
- Mass
- 0.94 M☉
- Radius
- 0.87 R☉
- Luminosity
- 0.5290 L☉
- Age
- 3.8 billion years (Sun: 4.6)
Planetary System
TOI-2876 b is the only planet known to orbit TOI-2876 so far.
TOI-2876 b — Complete Data
| Radius | 9.640 Earth radii (0.860 Jupiter radii) |
|---|---|
| Mass | 54.03 Earth masses (0.170 Jupiter masses) |
| Density | 0.33 g/cm³ (Earth: 5.51) |
| Orbital period | 6.30 days |
| Orbital distance | 0.065 AU |
| Eccentricity | 0.130 |
| Equilibrium temperature | 929 K (656 °C) |
| Stellar irradiation | 124.20× Earth |
| Distance from Earth | 736.3 light-years (225.7 parsecs) |
| Constellation | Canis Major |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2025 |
Data: NASA Exoplanet Archive, last updated 2025-07-29. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-2876 b
Is TOI-2876 b habitable?
No — TOI-2876 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-2876 b?
TOI-2876 b is about 736 light-years from Earth in the constellation Canis Major. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 12,958,880 years to get there.
How big is TOI-2876 b compared to Earth?
TOI-2876 b has 9.64 times the radius of Earth and about 54.0 times its mass.
How long is a year on TOI-2876 b?
One orbit around TOI-2876 takes 6.3 Earth days — short enough that 58 of its years would fit into one Earth year.
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