WASP-5 b
WASP-5 b is a hot Jupiter orbiting WASP-5 in the constellation Phoenix. It lies about 1,008 light-years from Earth and was discovered in 2008 using the transit method.
How Big Is WASP-5 b?
WASP-5 b has a radius of 12.18 times that of Earth, or 1.09 times the radius of Jupiter. Its mass is 502 times that of Earth, giving it a density of 1.64 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is WASP-5 b in the Habitable Zone?
WASP-5 b orbits inside the inner edge of the habitable zone of WASP-5. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of WASP-5: 0.755–1.783 AU (conservative: 0.956–1.690 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on WASP-5 b
The equilibrium temperature of WASP-5 b is about 1,706 K (1,433 °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-5 b — one full orbit around WASP-5 — lasts just 39.1 hours, shorter than Mercury's 88-day year. It orbits at an average distance of 0.027 AU — closer to its star than Mercury is to the Sun. Its orbit is nearly circular (eccentricity 0.038).
How Was WASP-5 b Discovered?
WASP-5 b was discovered in 2008 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-5 b?
WASP-5 b is 1,008.3 light-years (309.1 parsecs) from Earth. Light arriving here tonight left the planet around the year 1018. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 17,746,080 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-5 b scores 0.07, ranking #4,843 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: WASP-5
WASP-5
- Surface temperature
- 5,700 K (Sun: 5,772 K)
- Mass
- 0.96 M☉
- Radius
- 1.03 R☉
- Age
- 5.4 billion years (Sun: 4.6)
Planetary System
WASP-5 b is the only planet known to orbit WASP-5 so far.
WASP-5 b — Complete Data
| Radius | 12.184 Earth radii (1.087 Jupiter radii) |
|---|---|
| Mass | 502.15 Earth masses (1.580 Jupiter masses) |
| Density | 1.64 g/cm³ (Earth: 5.51) |
| Orbital period | 1.63 days |
| Orbital distance | 0.027 AU |
| Eccentricity | 0.038 |
| Equilibrium temperature | 1,706 K (1,433 °C) |
| Earth Similarity Index | 0.07 |
| Distance from Earth | 1,008.3 light-years (309.1 parsecs) |
| Constellation | Phoenix |
| Discovery method | Transit |
| Discovery facility | SuperWASP |
| Discovery year | 2008 |
Data: NASA Exoplanet Archive, last updated 2014-10-29. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About WASP-5 b
Is WASP-5 b habitable?
No — WASP-5 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is WASP-5 b?
WASP-5 b is about 1,008 light-years from Earth in the constellation Phoenix. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 17,746,080 years to get there.
How big is WASP-5 b compared to Earth?
WASP-5 b has 12.18 times the radius of Earth and about 502 times its mass.
How long is a year on WASP-5 b?
One orbit around WASP-5 takes 1.6 Earth days — short enough that 224 of its years would fit into one Earth year.
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