TOI-7265 B b
TOI-7265 B b is a hot Jupiter orbiting the M2 V star TOI-7265 B in the constellation Cygnus. It lies about 470 light-years from Earth and was discovered in 2026 using the transit method.
How Big Is TOI-7265 B b?
TOI-7265 B b has a radius of 10.70 times that of Earth, or 0.95 times the radius of Jupiter. Its mass is 225 times that of Earth, giving it a density of 1.01 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is TOI-7265 B b in the Habitable Zone?
TOI-7265 B b orbits inside the inner edge of the habitable zone of TOI-7265 B. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-7265 B: 0.151–0.391 AU (conservative: 0.191–0.371 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-7265 B b
The equilibrium temperature of TOI-7265 B b is about 571 K (298 °C) — hotter than anywhere on Earth. This estimate ignores any atmosphere, which could change surface temperatures dramatically — Earth's greenhouse effect adds about 33 °C. It receives 17.70 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-7265 B b — one full orbit around TOI-7265 B — lasts 4.17 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.040 AU — closer to its star than Mercury is to the Sun. Its orbit is nearly circular (eccentricity 0.037).
How Was TOI-7265 B b Discovered?
TOI-7265 B b was discovered in 2026 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-7265 B b?
TOI-7265 B b is 469.6 light-years (144.0 parsecs) from Earth. Light arriving here tonight left the planet around the year 1557. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 8,264,960 years to make the journey.
The Host Star: TOI-7265 B
TOI-7265 B b belongs to a system of 2 stars; it orbits TOI-7265 B.
TOI-7265 B
- Spectral type
- M2 V
- Surface temperature
- 3,503 K (Sun: 5,772 K)
- Mass
- 0.52 M☉
- Radius
- 0.50 R☉
- Luminosity
- 0.0340 L☉
Planetary System
TOI-7265 B b is the only planet known to orbit TOI-7265 B so far.
TOI-7265 B b — Complete Data
| Radius | 10.700 Earth radii (0.950 Jupiter radii) |
|---|---|
| Mass | 224.95 Earth masses (0.710 Jupiter masses) |
| Density | 1.01 g/cm³ (Earth: 5.51) |
| Orbital period | 4.17 days |
| Orbital distance | 0.040 AU |
| Eccentricity | 0.037 |
| Equilibrium temperature | 571 K (298 °C) |
| Stellar irradiation | 17.70× Earth |
| Distance from Earth | 469.6 light-years (144.0 parsecs) |
| Constellation | Cygnus |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2026 |
Data: NASA Exoplanet Archive, last updated 2026-08-20. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-7265 B b
Is TOI-7265 B b habitable?
No — TOI-7265 B b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-7265 B b?
TOI-7265 B b is about 470 light-years from Earth in the constellation Cygnus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 8,264,960 years to get there.
How big is TOI-7265 B b compared to Earth?
TOI-7265 B b has 10.70 times the radius of Earth and about 225 times its mass.
How long is a year on TOI-7265 B b?
One orbit around TOI-7265 B takes 4.2 Earth days — short enough that 88 of its years would fit into one Earth year.
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