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WASP-22b is an extrasolar planet orbiting the Sun-like star WASP-22 320 parsecs (1,000 ly) in the constellation Orion.[1][2] This hot Jupiter has an orbit of 3.53 days and a mass of 0.617 MJ was detected by transit via SuperWASP. The system is a hierarchical triple system.[3]

WASP-22b
A comparison between the sizes of WASP-22b (right) and Jupiter
Discovery
Discovered byMaxted, et al.
Discovery siteSouth African Astronomical Observatory
Discovery datePublished December 2010
Detection method
Transit photometry
Orbital characteristics
Epoch J2000
Semi-major axis
0.04698 (± 0.00037) AU
Eccentricity0.0
Orbital period (sidereal)
3.5327313 (± 5.8e-06) d
Inclination88.26 (± 0.91)
StarWASP-22
Physical characteristics
Mean radius
1.199 RJ
Mass0.617 MJ
Temperature1298 K

    Naming


    In 2019 the IAU announced as part of NameExoWorlds that WASP-22 and its planet WASP-22b would be given official names chosen by school children from Guatemala.[4][5] The star WASP-22 is named Tojil. Tojil is the name of one of the Mayan deities related to rain, storms, and fire. The planet WASP-22b is named Koyopa'. Koyopa' is the word associated with lightning in K'iche' (Quiché) Mayan language.[6][7]


    Physical characteristics


    The Rossiter-McLaughlin effect effect based study in 2011 have determined the planetary orbit is slightly misaligned to the rotational axis of the parent star, with reported angle 22±16 degrees.[8]


    References


    1. 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:1609.04172. Bibcode:2016A&A...595A...2G. doi:10.1051/0004-6361/201629512.Gaia Data Release 1 catalog entry
    2. "CONFIRMED PLANET OVERVIEW PAGE". Nasa Exoplanet Archive. Retrieved 2016-04-26.
    3. Maxted, P. F. L.; Anderson, D. R.; Gillon, M.; Hellier, C.; Queloz, D.; Smalley, B.; Triaud, A. H. M. J.; West, R. G.; Wilson, D. M. (2010-01-01). "WASP-22 b: A Transiting "Hot Jupiter" Planet in a Hierarchical Triple System". The Astronomical Journal. 140 (6): 2007. arXiv:1004.1514. Bibcode:2010AJ....140.2007M. doi:10.1088/0004-6256/140/6/2007. ISSN 1538-3881.
    4. "NameExoWorlds". 2019. Retrieved 6 September 2019.
    5. "Naming". 2019. Retrieved 6 September 2019.
    6. "Approved names". NameExoworlds. Retrieved 2020-01-02.
    7. "International Astronomical Union | IAU". www.iau.org. Retrieved 2020-01-02.
    8. Anderson, D. R.; Collier Cameron, A.; Gillon, M.; Hellier, C.; Jehin, E.; Lendl, M.; Queloz, D.; Smalley, B.; Triaud, A. H. M. J.; Vanhuysse, M. (2011). "Spin-orbit measurements and refined parameters for the exoplanet systems WASP-22 and WASP-26". Astronomy & Astrophysics. 534: A16. arXiv:1106.6092. Bibcode:2011A&A...534A..16A. doi:10.1051/0004-6361/201117597.


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