TOI-1448 b
TOI-1448 b is a super-Earth orbiting TOI-1448 in the constellation Cepheus. It lies about 239 light-years from Earth and was discovered in 2024 using the transit method.
How Big Is TOI-1448 b?
TOI-1448 b has a radius of 2.75 times that of Earth. Its mass is 19.5 times that of Earth.
Is TOI-1448 b in the Habitable Zone?
TOI-1448 b orbits inside the inner edge of the habitable zone of TOI-1448. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-1448: 0.109–0.283 AU (conservative: 0.138–0.268 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-1448 b
The equilibrium temperature of TOI-1448 b is about 426 K (153 °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 5.45 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-1448 b — one full orbit around TOI-1448 — lasts 8.11 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.057 AU — closer to its star than Mercury is to the Sun. Its orbit is highly elliptical (eccentricity 0.36), swinging dramatically closer to and farther from its star.
How Was TOI-1448 b Discovered?
TOI-1448 b was discovered in 2024 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-1448 b?
TOI-1448 b is 239.2 light-years (73.3 parsecs) from Earth. Light arriving here tonight left the planet around the year 1787. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 4,209,920 years to make the journey.
The Host Star: TOI-1448
TOI-1448
- Surface temperature
- 3,412 K (Sun: 5,772 K)
- Mass
- 0.37 M☉
- Radius
- 0.38 R☉
- Luminosity
- 0.0176 L☉
Planetary System
TOI-1448 b is the only planet known to orbit TOI-1448 so far.
TOI-1448 b — Complete Data
| Radius | 2.749 Earth radii (0.245 Jupiter radii) |
|---|---|
| Mass | 19.50 Earth masses (0.061 Jupiter masses) |
| Orbital period | 8.11 days |
| Orbital distance | 0.057 AU |
| Eccentricity | 0.360 |
| Equilibrium temperature | 426 K (153 °C) |
| Stellar irradiation | 5.45× Earth |
| Distance from Earth | 239.2 light-years (73.3 parsecs) |
| Constellation | Cepheus |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2024 |
Data: NASA Exoplanet Archive, last updated 2025-12-18. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-1448 b
Is TOI-1448 b habitable?
No — TOI-1448 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-1448 b?
TOI-1448 b is about 239 light-years from Earth in the constellation Cepheus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 4,209,920 years to get there.
How big is TOI-1448 b compared to Earth?
TOI-1448 b has 2.75 times the radius of Earth and about 19.5 times its mass.
How long is a year on TOI-1448 b?
One orbit around TOI-1448 takes 8.1 Earth days — short enough that 45 of its years would fit into one Earth year.
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