TOI-6448 b
TOI-6448 b is a cold gas giant orbiting TOI-6448 in the constellation Puppis. It lies about 1,262 light-years from Earth and was discovered in 2025 using the transit method.
How Big Is TOI-6448 b?
TOI-6448 b has a radius of 8.47 times that of Earth, or 0.76 times the radius of Jupiter.
Is TOI-6448 b in the Habitable Zone?
TOI-6448 b orbits inside the inner edge of the habitable zone of TOI-6448. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-6448: 0.709–1.666 AU (conservative: 0.899–1.579 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-6448 b
The equilibrium temperature of TOI-6448 b is about 745 K (472 °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.
Orbit and Year Length
A year on TOI-6448 b — one full orbit around TOI-6448 — lasts 14.8 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.131 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.20).
How Was TOI-6448 b Discovered?
TOI-6448 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-6448 b?
TOI-6448 b is 1,261.8 light-years (386.9 parsecs) from Earth. Light arriving here tonight left the planet about 1,262 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 22,207,680 years to make the journey.
The Host Star: TOI-6448
TOI-6448
- Surface temperature
- 5,910 K (Sun: 5,772 K)
- Mass
- 1.03 M☉
- Radius
- 0.90 R☉
- Luminosity
- 0.9080 L☉
- Age
- 0.0 billion years (Sun: 4.6)
Planetary System
TOI-6448 b is the only planet known to orbit TOI-6448 so far.
TOI-6448 b — Complete Data
| Radius | 8.474 Earth radii (0.756 Jupiter radii) |
|---|---|
| Orbital period | 14.84 days |
| Orbital distance | 0.131 AU |
| Eccentricity | 0.200 |
| Equilibrium temperature | 745 K (472 °C) |
| Distance from Earth | 1,261.8 light-years (386.9 parsecs) |
| Constellation | Puppis |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2025 |
Data: NASA Exoplanet Archive, last updated 2025-12-04. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-6448 b
Is TOI-6448 b habitable?
No — TOI-6448 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-6448 b?
TOI-6448 b is about 1,262 light-years from Earth in the constellation Puppis. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 22,207,680 years to get there.
How big is TOI-6448 b compared to Earth?
TOI-6448 b has 8.47 times the radius of Earth.
How long is a year on TOI-6448 b?
One orbit around TOI-6448 takes 14.8 Earth days — short enough that 25 of its years would fit into one Earth year.
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