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Exoplanet List of exoplanets
Exoplanet Comparison WASP-1 b.png
Size comparison of WASP-1b with Jupiter.
Parent star
Star WASP-1
Constellation Andromeda
Right ascension (α) 00h 20m 40s
Declination (δ) +31° 59′ 24″
Apparent magnitude (mV) 11.79
Distance 1239 ly
(380 pc)
Spectral type F7V
Orbital elements
Semi-major axis (a) 0.0382 (± 0.0013) AU
Eccentricity (e) 0
Orbital period (P) 2.5199464 (± 8e-07) d
Inclination (i) 88.65 (± 0.55)°
Time of transit (Tt) 2454461.863 (± 0.0002) JD
Physical characteristics
Mass (m) 0.86 ± 0.07 MJ
Radius (r) 1.484 +0.06
Density (ρ) 476 kg m−3
Surface gravity (g) 12.5 m/s² (1.27 g)
Temperature (T) 1800
Discovery information
Discovery date September 25, 2006
Discoverer(s) Cameron et al. (SuperWASP
 South Africa
and  France
Discovery method Transit
Discovery site SAAO
Discovery status Published
Other designations
Garafia-1 (unofficial nickname)
Database references
Extrasolar Planets
Exoplanet Archive data
Open Exoplanet Catalogue data

WASP-1b is an extrasolar planet orbiting the star WASP-1 located 1,239 light-years away in the constellation Andromeda. In recognition of the regional support given to the project on La Palma, the discoverers gave the planet the alternative designation Garafia-1.

Orbit and mass[edit]

The radial velocity trend of WASP-1, caused by the presence of WASP-1 b.

The planet's mass and radius indicate that it is a gas giant with a similar bulk composition to Jupiter. Unlike Jupiter, but similar to many other planets detected around other stars, WASP-1b is located very close to its star, and belongs to the class of planets known as hot Jupiters.

WASP-1 b was discovered via the transit method by SuperWASP, for which the star and planet are named. Follow-up radial velocity measurements confirmed the presence of an unseen companion, and allowed for the mass of WASP-1 b to be determined.[1]

See also[edit]


  1. ^ Cameron, A. Collier; et al. (2007). "WASP-1b and WASP-2b: two new transiting exoplanets detected with SuperWASP and SOPHIE". Monthly Notices of the Royal Astronomical Society. 375 (3): 951–957. arXiv:astro-ph/0609688Freely accessible. Bibcode:2007MNRAS.375..951C. doi:10.1111/j.1365-2966.2006.11350.x. 

Further reading[edit]

External links[edit]

Media related to WASP-1b at Wikimedia Commons

Coordinates: Sky map 00h 20m 40s, +31° 59′ 24″