TOI-3457 b
TOI-3457 b is a cold gas giant orbiting TOI-3457 in the constellation Chamaeleon. It lies about 1,209 light-years from Earth and was discovered in 2026 using the transit method.
How Big Is TOI-3457 b?
TOI-3457 b has a radius of 10.64 times that of Earth, or 0.95 times the radius of Jupiter. Its mass is 798 times that of Earth.
Is TOI-3457 b in the Habitable Zone?
TOI-3457 b orbits inside the inner edge of the habitable zone of TOI-3457. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-3457: 1.018–2.372 AU (conservative: 1.290–2.249 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-3457 b
The equilibrium temperature of TOI-3457 b is about 824 K (551 °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-3457 b — one full orbit around TOI-3457 — lasts 32.6 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.200 AU — closer to its star than Mercury is to the Sun. Its orbit is highly elliptical (eccentricity 0.59), swinging dramatically closer to and farther from its star.
How Was TOI-3457 b Discovered?
TOI-3457 b was discovered in 2026 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-3457 b?
TOI-3457 b is 1,208.9 light-years (370.7 parsecs) from Earth. Light arriving here tonight left the planet about 1,209 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 21,276,640 years to make the journey.
The Host Star: TOI-3457
TOI-3457
- Surface temperature
- 6,300 K (Sun: 5,772 K)
- Mass
- 1.04 M☉
- Radius
- 1.47 R☉
- Luminosity
- 1.9620 L☉
Planetary System
TOI-3457 b is the only planet known to orbit TOI-3457 so far.
TOI-3457 b — Complete Data
| Radius | 10.640 Earth radii (0.949 Jupiter radii) |
|---|---|
| Mass | 797.75 Earth masses (2.510 Jupiter masses) |
| Orbital period | 32.60 days |
| Orbital distance | 0.200 AU |
| Eccentricity | 0.590 |
| Equilibrium temperature | 824 K (551 °C) |
| Distance from Earth | 1,208.9 light-years (370.7 parsecs) |
| Constellation | Chamaeleon |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2026 |
Data: NASA Exoplanet Archive, last updated 2026-06-04. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-3457 b
Is TOI-3457 b habitable?
No — TOI-3457 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-3457 b?
TOI-3457 b is about 1,209 light-years from Earth in the constellation Chamaeleon. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 21,276,640 years to get there.
How big is TOI-3457 b compared to Earth?
TOI-3457 b has 10.64 times the radius of Earth and about 798 times its mass.
How long is a year on TOI-3457 b?
One orbit around TOI-3457 takes 32.6 Earth days — short enough that 11 of its years would fit into one Earth year.
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