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Exoplanet List of exoplanets
Exoplanet Comparison WASP-8 b.png
Size comparison of WASP-8b with Jupiter.
Parent star
Star WASP-8
Constellation Sculptor
Right ascension (α) 23h 59m 36.0711s[1]
Declination (δ) −35° 01′ 52.920″[1]
Apparent magnitude (mV) 9.9
Distance291±7[1] ly
(89±2[1] pc)
Spectral type G6
Mass (m) 1.00+0.02
Orbital elements
Semi-major axis(a) 0.0793 AU
Orbital period(P) 8.16 d
Physical characteristics
Mass(m)2.23 MJ
Radius(r)1.17 RJ
Density(ρ)1.85[2] g cm−3
Surface gravity(g)4.30 g
Temperature (T) 950 (varies)[3]
Discovery information
Discovery date April 1, 2008
Discoverer(s) Cameron et al. (SuperWASP)
Discovery method Transit
Discovery status Confirmed

WASP-8b is an extrasolar planet discovered (with their stars) in the SuperWASP batch -6b to -15b. On 1 April 2008, Dr. Don Pollacco of Queen’s University Belfast announced them at the RAS National Astronomy Meeting (NAM 2008).[4]

This system is located 89 parsecs away, which is closer than most Hot Jupiters. It is denser than Jupiter.

The planet orbits retrograde.[5][6]

The equilibrium temperature is 950 K, but this oscillates due to eccentricity.[3]

See also[edit]


  1. ^ a b c d Brown, A. G. A; et al. (2016). "Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties". Astronomy and Astrophysics. 595. A2. arXiv:1609.04172Freely accessible. Bibcode:2016A&A...595A...2G. doi:10.1051/0004-6361/201629512. Gaia Data Release 1 catalog entry
  2. ^ Density is calculated from the mass and the radius, assuming a circular disc of eclipse relative to the Earth.
  3. ^ a b Patricio Cubillos et al., "The Characterization of the Cool and Eccentric Exoplanet WASP-8b with Spitzer" in DPS Annual Meeting session "103.Extrasolar Planets: Atmospheric Chemistry and Characterization" (Monday, Oct 15, 2012, 11:40 AM -11:50 AM).
  4. ^ "THE (SUPER)WASP FACTORY FINDS 10 NEW PLANETS IN THE LAST 6 MONTHS". 2008. Retrieved 2009-05-13. 
  5. ^ European Southern Observatory. "Artist's impression of an exoplanet WASP 8b in a retrograde orbit". 
  6. ^ Didier Queloz; et al. (2010). "WASP-8b: a retrograde transiting planet in a multiple system". Astronomy and Astrophysics. 517: L1. arXiv:1006.5089Freely accessible. Bibcode:2010A&A...517L...1Q. doi:10.1051/0004-6361/201014768. 

External links[edit]

Media related to WASP-8b at Wikimedia Commons

Coordinates: Sky map 23h 59m 36.07s, −35° 01′ 52.9″