WASP-158 b
WASP-158 b is a hot Jupiter orbiting the F6 V star WASP-158 in the constellation Cetus. It lies about 1,712 light-years from Earth and was discovered in 2018 using the transit method.
How Big Is WASP-158 b?
WASP-158 b has a radius of 11.99 times that of Earth, or 1.07 times the radius of Jupiter. Its mass is 887 times that of Earth, giving it a density of 3.10 g/cm³ — between that of rocky and gaseous planets.
Is WASP-158 b in the Habitable Zone?
WASP-158 b orbits inside the inner edge of the habitable zone of WASP-158. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of WASP-158: 1.217–2.832 AU (conservative: 1.541–2.685 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on WASP-158 b
The equilibrium temperature of WASP-158 b is about 1,590 K (1,317 °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 WASP-158 b — one full orbit around WASP-158 — lasts 3.66 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.052 AU — closer to its star than Mercury is to the Sun.
How Was WASP-158 b Discovered?
WASP-158 b was discovered in 2018 using the transit method, with observations from SuperWASP-South.
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-158 b?
WASP-158 b is 1,712.3 light-years (525.0 parsecs) from Earth. Light arriving here tonight left the planet about 1,712 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 30,136,480 years to make the journey.
Earth Similarity Index
The Earth Similarity Index (ESI) scores how physically similar a planet is to Earth, from 0 to 1, based on radius, density, escape velocity and surface temperature. WASP-158 b scores 0.07, ranking #4,798 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: WASP-158
WASP-158
- Spectral type
- F6 V
- Surface temperature
- 6,350 K (Sun: 5,772 K)
- Mass
- 1.38 M☉
- Radius
- 1.39 R☉
- Age
- 1.9 billion years (Sun: 4.6)
Planetary System
WASP-158 b is the only planet known to orbit WASP-158 so far.
WASP-158 b — Complete Data
| Radius | 11.994 Earth radii (1.070 Jupiter radii) |
|---|---|
| Mass | 886.75 Earth masses (2.790 Jupiter masses) |
| Density | 3.10 g/cm³ (Earth: 5.51) |
| Orbital period | 3.66 days |
| Orbital distance | 0.052 AU |
| Equilibrium temperature | 1,590 K (1,317 °C) |
| Earth Similarity Index | 0.07 |
| Distance from Earth | 1,712.3 light-years (525.0 parsecs) |
| Constellation | Cetus |
| Discovery method | Transit |
| Discovery facility | SuperWASP-South |
| Discovery year | 2018 |
Data: NASA Exoplanet Archive, last updated 2018-10-24. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About WASP-158 b
Is WASP-158 b habitable?
No — WASP-158 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is WASP-158 b?
WASP-158 b is about 1,712 light-years from Earth in the constellation Cetus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 30,136,480 years to get there.
How big is WASP-158 b compared to Earth?
WASP-158 b has 11.99 times the radius of Earth and about 887 times its mass.
How long is a year on WASP-158 b?
One orbit around WASP-158 takes 3.7 Earth days — short enough that 100 of its years would fit into one Earth year.
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