TOI-2267 b
TOI-2267 b is a terrestrial planet orbiting the M5 V star TOI-2267 A in the constellation Cepheus. It was discovered in 2025 using the transit method.
How Big Is TOI-2267 b?
TOI-2267 b has a radius of 1.00 times that of Earth.
Is TOI-2267 b in the Habitable Zone?
TOI-2267 b orbits inside the inner edge of the habitable zone of TOI-2267 A. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-2267 A: 0.047–0.125 AU (conservative: 0.060–0.119 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-2267 b
The equilibrium temperature of TOI-2267 b is about 424 K (151 °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 8.40 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-2267 b — one full orbit around TOI-2267 A — lasts 2.29 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.021 AU — closer to its star than Mercury is to the Sun.
How Was TOI-2267 b Discovered?
TOI-2267 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.
The Host Star: TOI-2267 A
TOI-2267 b belongs to a system of 2 stars; it orbits TOI-2267 A.
TOI-2267 A
- Spectral type
- M5 V
- Surface temperature
- 3,030 K (Sun: 5,772 K)
- Mass
- 0.17 M☉
- Radius
- 0.21 R☉
- Luminosity
- 0.0033 L☉
- Age
- 1.0 billion years (Sun: 4.6)
The TOI-2267 A Planetary System
TOI-2267 b is one of 2 known planets in the TOI-2267 A system. Its siblings:
- TOI-2267 c (Terrestrial)
TOI-2267 b — Complete Data
| Radius | 1.000 Earth radii (0.089 Jupiter radii) |
|---|---|
| Orbital period | 2.29 days |
| Orbital distance | 0.021 AU |
| Equilibrium temperature | 424 K (151 °C) |
| Stellar irradiation | 8.40× Earth |
| Constellation | Cepheus |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2025 |
Data: NASA Exoplanet Archive, last updated 2026-03-05. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-2267 b
Is TOI-2267 b habitable?
No — TOI-2267 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How big is TOI-2267 b compared to Earth?
TOI-2267 b has 1.00 times the radius of Earth.
How long is a year on TOI-2267 b?
One orbit around TOI-2267 A takes 2.3 Earth days — short enough that 160 of its years would fit into one Earth year.
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