WASP-22 b
WASP-22 b is a hot Jupiter orbiting WASP-22 in the constellation Eridanus. It lies about 1,036 light-years from Earth and was discovered in 2010 using the transit method.
How Big Is WASP-22 b?
WASP-22 b has a radius of 13.79 times that of Earth, or 1.23 times the radius of Jupiter. Its mass is 213 times that of Earth.
Is WASP-22 b in the Habitable Zone?
The position of WASP-22 b relative to the habitable zone of WASP-22 cannot be precisely determined from the available orbital data.
Habitable zone of WASP-22: 0.990–2.320 AU (conservative: 1.254–2.199 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 ›
Orbit and Year Length
A year on WASP-22 b — one full orbit around WASP-22 — lasts 3.53 Earth days, shorter than Mercury's 88-day year. Its orbit is nearly circular (eccentricity 0.020).
How Was WASP-22 b Discovered?
WASP-22 b was discovered in 2010 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-22 b?
WASP-22 b is 1,036.0 light-years (317.7 parsecs) from Earth. Light arriving here tonight left the planet about 1,036 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 18,233,600 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-22 b scores 0.07, ranking #5,019 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: WASP-22
WASP-22
- Surface temperature
- 6,000 K (Sun: 5,772 K)
- Mass
- 1.46 M☉
- Radius
- 1.24 R☉
Planetary System
WASP-22 b is the only planet known to orbit WASP-22 so far.
WASP-22 b — Complete Data
| Radius | 13.787 Earth radii (1.230 Jupiter radii) |
|---|---|
| Mass | 212.95 Earth masses (0.670 Jupiter masses) |
| Orbital period | 3.53 days |
| Eccentricity | 0.020 |
| Earth Similarity Index | 0.07 |
| Distance from Earth | 1,036.0 light-years (317.7 parsecs) |
| Constellation | Eridanus |
| Discovery method | Transit |
| Discovery facility | SuperWASP |
| Discovery year | 2010 |
Data: NASA Exoplanet Archive, last updated 2018-04-25. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About WASP-22 b
Is WASP-22 b habitable?
WASP-22 b is not known to orbit within the habitable zone of WASP-22, and as a hot Jupiter it is an unlikely candidate for life as we know it.
How far away is WASP-22 b?
WASP-22 b is about 1,036 light-years from Earth in the constellation Eridanus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 18,233,600 years to get there.
How big is WASP-22 b compared to Earth?
WASP-22 b has 13.79 times the radius of Earth and about 213 times its mass.
How long is a year on WASP-22 b?
One orbit around WASP-22 takes 3.5 Earth days — short enough that 103 of its years would fit into one Earth year.
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