TOI-2449 b
TOI-2449 b is a cold gas giant orbiting the G star TOI-2449 in the constellation Eridanus. It lies about 511 light-years from Earth and was discovered in 2025 using the transit method.
How Big Is TOI-2449 b?
TOI-2449 b has a radius of 11.24 times that of Earth, or 1.00 times the radius of Jupiter. Its mass is 222 times that of Earth.
Is TOI-2449 b in the Habitable Zone?
TOI-2449 b orbits inside the inner edge of the habitable zone of TOI-2449. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-2449: 0.855–2.003 AU (conservative: 1.083–1.899 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-2449 b
The equilibrium temperature of TOI-2449 b is about 400 K (127 °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-2449 b — one full orbit around TOI-2449 — lasts 106.1 Earth days, between the years of Mercury (88 days) and Earth (365 days). It orbits at an average distance of 0.450 AU — comparable to the inner Solar System. Its orbit is mildly elliptical (eccentricity 0.10).
How Was TOI-2449 b Discovered?
TOI-2449 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-2449 b?
TOI-2449 b is 511.4 light-years (156.8 parsecs) from Earth. Light arriving here tonight left the planet around the year 1515. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 9,000,640 years to make the journey.
The Host Star: TOI-2449
TOI-2449
- Spectral type
- G
- Surface temperature
- 6,021 K (Sun: 5,772 K)
- Mass
- 1.08 M☉
- Radius
- 1.07 R☉
- Age
- 2.5 billion years (Sun: 4.6)
Planetary System
TOI-2449 b is the only planet known to orbit TOI-2449 so far.
TOI-2449 b — Complete Data
| Radius | 11.240 Earth radii (1.002 Jupiter radii) |
|---|---|
| Mass | 222.00 Earth masses (0.700 Jupiter masses) |
| Orbital period | 106.14 days |
| Orbital distance | 0.450 AU |
| Eccentricity | 0.098 |
| Equilibrium temperature | 400 K (127 °C) |
| Distance from Earth | 511.4 light-years (156.8 parsecs) |
| Constellation | Eridanus |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2025 |
Data: NASA Exoplanet Archive, last updated 2025-10-09. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-2449 b
Is TOI-2449 b habitable?
No — TOI-2449 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-2449 b?
TOI-2449 b is about 511 light-years from Earth in the constellation Eridanus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 9,000,640 years to get there.
How big is TOI-2449 b compared to Earth?
TOI-2449 b has 11.24 times the radius of Earth and about 222 times its mass.
How long is a year on TOI-2449 b?
One orbit around TOI-2449 takes 106.1 Earth days.
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