WASP-5b

WASP-5b is an exoplanet orbiting the star WASP-5 located approximately 1000 light-years away in the constellation Phoenix. The planet's mass and radius indicate that it is a gas giant with a similar bulk composition to Jupiter. The small orbital distance of WASP-5 b around its star means it belongs to a class of planets known as hot Jupiters. The planetary equilibrium temperature would be 1717 K,^[1] but the measured dayside temperature is higher, with a 2015 study finding 2500±100 K^[4] and a 2020 study finding 2000±90 K.^[3]

WASP-5b

Size comparison of WASP-5b with Jupiter.
Discovery[1]
Discovered by	Anderson et al. (SuperWASP)
Discovery site	SAAO
Discovery date	October 31, 2007
Detection method	Transit
Orbital characteristics[2]
Semi-major axis	0.02739 ± 0.00039 AU (4,097,000 ± 58,000 km)
Eccentricity	<0.012
Orbital period (sidereal)	1.62842953(52) d
Inclination	85.8°±1.1°
Semi-amplitude	268.2+4.6 −4.2 m/s
Star	WASP-5
Physical characteristics[2]
Mean radius	1.175±0.056 RJ
Mass	1.590+0.053 −0.052 MJ
Mean density	1.21+0.20 −0.16 g/cm3
Surface gravity	28.6 m/s2 2.9 g
Temperature	2000±90 K (1,730 °C; 3,140 °F)[3]

A study in 2012, utilizing the Rossiter–McLaughlin effect, determined that the planetary orbit is probably aligned with the equatorial plane of the star, with misalignment equal to 12.1⁺⁸
₋₁₀°.^[5]

See also

• SuperWASP
• WASP-4b
• WASP-3b