WASP-149 b
WASP-149 b is a hot Jupiter orbiting WASP-149 in the constellation Hydra. It lies about 691 light-years from Earth and was discovered in 2025 using the transit method.
How Big Is WASP-149 b?
WASP-149 b has a radius of 15.24 times that of Earth, or 1.36 times the radius of Jupiter. Its mass is 315 times that of Earth, giving it a density of 0.49 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is WASP-149 b in the Habitable Zone?
WASP-149 b orbits inside the inner edge of the habitable zone of WASP-149. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of WASP-149: 0.804–1.896 AU (conservative: 1.018–1.797 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 WASP-149 b
The equilibrium temperature of WASP-149 b is about 1,855 K (1,582 °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. It receives 1,966 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on WASP-149 b — one full orbit around WASP-149 — lasts just 32.0 hours, shorter than Mercury's 88-day year. It orbits at an average distance of 0.024 AU — closer to its star than Mercury is to the Sun.
How Was WASP-149 b Discovered?
WASP-149 b was discovered in 2025 using the transit method, with observations from SuperWASP.
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 WASP-149 b?
WASP-149 b is 690.6 light-years (211.7 parsecs) from Earth. Light arriving here tonight left the planet around the year 1336. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 12,154,560 years to make the journey.
The Host Star: WASP-149
WASP-149
- Surface temperature
- 5,750 K (Sun: 5,772 K)
- Mass
- 1.05 M☉
- Radius
- 1.08 R☉
- Age
- 0.6 billion years (Sun: 4.6)
Planetary System
WASP-149 b is the only planet known to orbit WASP-149 so far.
WASP-149 b — Complete Data
| Radius | 15.244 Earth radii (1.360 Jupiter radii) |
|---|---|
| Mass | 314.97 Earth masses (0.991 Jupiter masses) |
| Density | 0.49 g/cm³ (Earth: 5.51) |
| Orbital period | 1.33 days |
| Orbital distance | 0.024 AU |
| Equilibrium temperature | 1,855 K (1,582 °C) |
| Stellar irradiation | 1,966.00× Earth |
| Distance from Earth | 690.6 light-years (211.7 parsecs) |
| Constellation | Hydra |
| Discovery method | Transit |
| Discovery facility | SuperWASP |
| Discovery year | 2025 |
Data: NASA Exoplanet Archive, last updated 2025-04-21. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About WASP-149 b
Is WASP-149 b habitable?
No — WASP-149 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is WASP-149 b?
WASP-149 b is about 691 light-years from Earth in the constellation Hydra. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 12,154,560 years to get there.
How big is WASP-149 b compared to Earth?
WASP-149 b has 15.24 times the radius of Earth and about 315 times its mass.
How long is a year on WASP-149 b?
One orbit around WASP-149 takes 1.3 Earth days — short enough that 274 of its years would fit into one Earth year.
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