TOI-7149 b
TOI-7149 b is a hot Jupiter orbiting the M4 V star TOI-7149 in the constellation Hercules. It lies about 411 light-years from Earth and was discovered in 2025 using the transit method.
How Big Is TOI-7149 b?
TOI-7149 b has a radius of 13.20 times that of Earth, or 1.18 times the radius of Jupiter. Its mass is 224 times that of Earth, giving it a density of 0.53 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is TOI-7149 b in the Habitable Zone?
TOI-7149 b orbits inside the inner edge of the habitable zone of TOI-7149. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-7149: 0.090–0.236 AU (conservative: 0.114–0.224 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-7149 b
The equilibrium temperature of TOI-7149 b is about 593 K (320 °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 20.60 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-7149 b — one full orbit around TOI-7149 — lasts 2.65 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.026 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.08).
How Was TOI-7149 b Discovered?
TOI-7149 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-7149 b?
TOI-7149 b is 411.4 light-years (126.1 parsecs) from Earth. Light arriving here tonight left the planet around the year 1615. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 7,240,640 years to make the journey.
The Host Star: TOI-7149
TOI-7149
- Spectral type
- M4 V
- Surface temperature
- 3,363 K (Sun: 5,772 K)
- Mass
- 0.34 M☉
- Radius
- 0.35 R☉
- Luminosity
- 0.0122 L☉
- Age
- 7.8 billion years (Sun: 4.6)
Planetary System
TOI-7149 b is the only planet known to orbit TOI-7149 so far.
TOI-7149 b — Complete Data
| Radius | 13.200 Earth radii (1.180 Jupiter radii) |
|---|---|
| Mass | 224.00 Earth masses (0.705 Jupiter masses) |
| Density | 0.53 g/cm³ (Earth: 5.51) |
| Orbital period | 2.65 days |
| Orbital distance | 0.026 AU |
| Eccentricity | 0.078 |
| Equilibrium temperature | 593 K (320 °C) |
| Stellar irradiation | 20.60× Earth |
| Distance from Earth | 411.4 light-years (126.1 parsecs) |
| Constellation | Hercules |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2025 |
Data: NASA Exoplanet Archive, last updated 2025-08-14. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-7149 b
Is TOI-7149 b habitable?
No — TOI-7149 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-7149 b?
TOI-7149 b is about 411 light-years from Earth in the constellation Hercules. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 7,240,640 years to get there.
How big is TOI-7149 b compared to Earth?
TOI-7149 b has 13.20 times the radius of Earth and about 224 times its mass.
How long is a year on TOI-7149 b?
One orbit around TOI-7149 takes 2.7 Earth days — short enough that 138 of its years would fit into one Earth year.
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