TOI-2447 b
TOI-2447 b is a cold gas giant orbiting TOI-2447 in the constellation Caelum. It lies about 486 light-years from Earth and was discovered in 2024 using the transit method.
How Big Is TOI-2447 b?
TOI-2447 b has a radius of 9.61 times that of Earth, or 0.86 times the radius of Jupiter. Its mass is 125 times that of Earth.
Is TOI-2447 b in the Habitable Zone?
TOI-2447 b orbits inside the inner edge of the habitable zone of TOI-2447. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-2447: 0.745–1.757 AU (conservative: 0.943–1.665 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-2447 b
The equilibrium temperature of TOI-2447 b is about 414 K (141 °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.
Orbit and Year Length
A year on TOI-2447 b — one full orbit around TOI-2447 — lasts 69.3 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.347 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.17).
How Was TOI-2447 b Discovered?
TOI-2447 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-2447 b?
TOI-2447 b is 485.9 light-years (149.0 parsecs) from Earth. Light arriving here tonight left the planet around the year 1541. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 8,551,840 years to make the journey.
The Host Star: TOI-2447
TOI-2447
- Surface temperature
- 5,730 K (Sun: 5,772 K)
- Mass
- 1.03 M☉
- Radius
- 1.01 R☉
- Age
- 2.1 billion years (Sun: 4.6)
Planetary System
TOI-2447 b is the only planet known to orbit TOI-2447 so far.
TOI-2447 b — Complete Data
| Radius | 9.606 Earth radii (0.857 Jupiter radii) |
|---|---|
| Mass | 124.91 Earth masses (0.393 Jupiter masses) |
| Orbital period | 69.34 days |
| Orbital distance | 0.347 AU |
| Eccentricity | 0.170 |
| Equilibrium temperature | 414 K (141 °C) |
| Distance from Earth | 485.9 light-years (149.0 parsecs) |
| Constellation | Caelum |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2024 |
Data: NASA Exoplanet Archive, last updated 2024-06-10. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-2447 b
Is TOI-2447 b habitable?
No — TOI-2447 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-2447 b?
TOI-2447 b is about 486 light-years from Earth in the constellation Caelum. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 8,551,840 years to get there.
How big is TOI-2447 b compared to Earth?
TOI-2447 b has 9.61 times the radius of Earth and about 125 times its mass.
How long is a year on TOI-2447 b?
One orbit around TOI-2447 takes 69.3 Earth days.
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