WASP-1b is an extrasolar planet orbiting the star WASP-1 located 1,300 light-years away in the constellation Andromeda.

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.

In 2018, it was discovered via observations of the Rossiter-McLaughlin effect that the orbit of WASP-1b is strongly misaligned with rotational axis of the star by 79.0
_−4.5 degrees, making it a nearly "polar" orbit.

• HD 209458 b
• WASP-2b

• Charbonneau, David; Winn, Joshua N.; Everett, Mark E.; Latham, David W.; Holman, Matthew J.; Esquerdo, Gilbert A.; o’Donovan, Francis T. (2007). "Precise Radius Estimates for the Exoplanets WASP-1b and WASP-2b". The Astrophysical Journal. 658 (2): 1322–1327. arXiv:astro-ph/0610589. Bibcode:2007ApJ...658.1322C. doi:10.1086/512008. S2CID 14099767.
• Shporer, A.; Tamuz, O.; Zucker, S.; Mazeh, T. (2007). "Photometric follow-up of the transiting planet around WASP-1". Monthly Notices of the Royal Astronomical Society. 376 (3): 1296–1300. arXiv:astro-ph/0610556. Bibcode:2007MNRAS.376.1296S. doi:10.1111/j.1365-2966.2007.11537.x. S2CID 12694181.

Media related to WASP-1b at Wikimedia Commons

• "Planet WASP-1 b". Extrasolar Planets Encyclopaedia. Retrieved 2018-11-07.
• BBC News article
• WASP Planets