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Exoplanet List of exoplanets
Exoplanet Comparison WASP-2 b.png
Size comparison of WASP-2b with Jupiter.
Parent star
Star WASP-2 A[1]
Constellation Delphinus
Right ascension (α) 20h 30m 54s
Declination (δ) +06° 25′ 46″
Apparent magnitude (mV) 11.98
Distance 470 ly
(144 pc)
Spectral type K1V
Orbital elements
Semi-major axis (a) 0.03138 (± 0.011) AU
Eccentricity (e) 0
Orbital period (P) 2.15222144 (± 4e-07) d
Inclination (i) 84.73 (± 0.19)°
Time of transit (Tt) 2453991.5153 (± 0.00017) JD
Physical characteristics
Mass (m) 0.847 ± 0.045 MJ
Radius (r) 1.079 ± 0.033 RJ
Surface gravity (g) 3.279 ± 0.036[1] g
Temperature (T) 1300 ± 54[1] K
Discovery information
Discovery date September 25, 2006
Discoverer(s) Cameron et al. (SuperWASP)
Discovery method Transit
Discovery site SAAO
Discovery status Published
Database references
Extrasolar Planets
Exoplanet Archive data
Open Exoplanet Catalogue data

WASP-2b is an extrasolar planet orbiting the star WASP-2 located about 470 light years away in the constellation of Delphinus. It was discovered via the transit method, and then follow up measurements using the radial velocity method confirmed that WASP-2b was a planet. 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-2b is located very close to its star, and belongs to the class of planets known as hot Jupiters.[2][3] A 2008 study concluded that the WASP-2b system (among others) is a binary star system allowing even more accurate determination of stellar and planetary parameters.[1]

See also[edit]


  1. ^ a b c d Daemgen; Hormuth, F.; Brandner, W.; Bergfors, C.; Janson, M.; Hippler, S.; Henning, T. (2009). "Binarity of transit host stars - Implications for planetary parameters" (PDF). Astronomy and Astrophysics. 498 (2): 567–574. arXiv:0902.2179Freely accessible. Bibcode:2009A&A...498..567D. doi:10.1051/0004-6361/200810988. 
  2. ^ 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. 
  3. ^ Charbonneau; Winn, Joshua N.; Everett, Mark E.; Latham, David W.; Holman, Matthew J.; Esquerdo, Gilbert A.; O’donovan, Francis T. (2006). "Precise Radius Estimates for the Exoplanets WASP-1b and WASP-2b". The Astrophysical Journal. 658 (2): 1322–1327. arXiv:astro-ph/0610589Freely accessible. Bibcode:2007ApJ...658.1322C. doi:10.1086/512008. 

External links[edit]

Media related to WASP-2b at Wikimedia Commons

Coordinates: Sky map 20h 30m 54s, +06° 25′ 46″