WASP-151 b
WASP-151 b is a hot Jupiter orbiting WASP-151 in the constellation Pisces. It lies about 1,478 light-years from Earth and was discovered in 2017 using the transit method.
How Big Is WASP-151 b?
WASP-151 b has a radius of 13.31 times that of Earth, or 1.19 times the radius of Jupiter. Its mass is 100 times that of Earth, giving it a density of 0.25 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is WASP-151 b in the Habitable Zone?
The position of WASP-151 b relative to the habitable zone of WASP-151 cannot be precisely determined from the available orbital data.
Temperature on WASP-151 b
The equilibrium temperature of WASP-151 b is about 1,312 K (1,039 °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-151 b — one full orbit around WASP-151 — lasts 4.53 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.055 AU — closer to its star than Mercury is to the Sun.
How Was WASP-151 b Discovered?
WASP-151 b was discovered in 2017 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-151 b?
WASP-151 b is 1,477.8 light-years (453.1 parsecs) from Earth. Light arriving here tonight left the planet about 1,478 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 26,009,280 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-151 b scores 0.07, ranking #4,952 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: WASP-151
WASP-151
- Mass
- 1.08 M☉
- Radius
- 1.18 R☉
- Age
- 5.5 billion years (Sun: 4.6)
Planetary System
WASP-151 b is the only planet known to orbit WASP-151 so far.
WASP-151 b — Complete Data
| Radius | 13.305 Earth radii (1.187 Jupiter radii) |
|---|---|
| Mass | 100.43 Earth masses (0.316 Jupiter masses) |
| Density | 0.25 g/cm³ (Earth: 5.51) |
| Orbital period | 4.53 days |
| Orbital distance | 0.055 AU |
| Equilibrium temperature | 1,312 K (1,039 °C) |
| Earth Similarity Index | 0.07 |
| Distance from Earth | 1,477.8 light-years (453.1 parsecs) |
| Constellation | Pisces |
| Discovery method | Transit |
| Discovery facility | SuperWASP-South |
| Discovery year | 2017 |
Data: NASA Exoplanet Archive, last updated 2022-02-22. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About WASP-151 b
Is WASP-151 b habitable?
WASP-151 b is not known to orbit within the habitable zone of WASP-151, and as a hot Jupiter it is an unlikely candidate for life as we know it.
How far away is WASP-151 b?
WASP-151 b is about 1,478 light-years from Earth in the constellation Pisces. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 26,009,280 years to get there.
How big is WASP-151 b compared to Earth?
WASP-151 b has 13.31 times the radius of Earth and about 100 times its mass.
How long is a year on WASP-151 b?
One orbit around WASP-151 takes 4.5 Earth days — short enough that 81 of its years would fit into one Earth year.
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