WASP-1 b
WASP-1 b is a hot Jupiter orbiting WASP-1 in the constellation Andromeda. It lies about 1,282 light-years from Earth and was discovered in 2007 using the transit method.
How Big Is WASP-1 b?
WASP-1 b has a radius of 16.62 times that of Earth, or 1.48 times the radius of Jupiter. Its mass is 271 times that of Earth, giving it a density of 0.35 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is WASP-1 b in the Habitable Zone?
The position of WASP-1 b relative to the habitable zone of WASP-1 cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on WASP-1 b — one full orbit around WASP-1 — lasts 2.52 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.039 AU — closer to its star than Mercury is to the Sun.
How Was WASP-1 b Discovered?
WASP-1 b was discovered in 2007 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-1 b?
WASP-1 b is 1,282.0 light-years (393.1 parsecs) from Earth. Light arriving here tonight left the planet about 1,282 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 22,563,200 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-1 b scores 0.06, ranking #5,225 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: WASP-1
WASP-1 b belongs to a system of 2 stars; it orbits WASP-1.
WASP-1
- Mass
- 1.24 M☉
- Radius
- 1.47 R☉
- Luminosity
- 2.7600 L☉
- Age
- 3.4 billion years (Sun: 4.6)
Planetary System
WASP-1 b is the only planet known to orbit WASP-1 so far.
WASP-1 b — Complete Data
| Radius | 16.623 Earth radii (1.483 Jupiter radii) |
|---|---|
| Mass | 271.42 Earth masses (0.854 Jupiter masses) |
| Density | 0.35 g/cm³ (Earth: 5.51) |
| Orbital period | 2.52 days |
| Orbital distance | 0.039 AU |
| Earth Similarity Index | 0.06 |
| Distance from Earth | 1,282.0 light-years (393.1 parsecs) |
| Constellation | Andromeda |
| Discovery method | Transit |
| Discovery facility | SuperWASP |
| Discovery year | 2007 |
Data: NASA Exoplanet Archive, last updated 2014-05-14. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About WASP-1 b
Is WASP-1 b habitable?
WASP-1 b is not known to orbit within the habitable zone of WASP-1, and as a hot Jupiter it is an unlikely candidate for life as we know it.
How far away is WASP-1 b?
WASP-1 b is about 1,282 light-years from Earth in the constellation Andromeda. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 22,563,200 years to get there.
How big is WASP-1 b compared to Earth?
WASP-1 b has 16.62 times the radius of Earth and about 271 times its mass.
How long is a year on WASP-1 b?
One orbit around WASP-1 takes 2.5 Earth days — short enough that 145 of its years would fit into one Earth year.
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