| WASP-22b / Koyopa' | |
| Discoverer: | Maxted, et al. |
| Discovery Site: | South African Astronomical Observatory |
| Discovered: | Published December 2010 |
| Discovery Method: | Transit photometry |
| Epoch: | J2000 |
| Apsis: | astron |
| Semimajor: | 0.04698 (± 0.00037) AU |
| Eccentricity: | 0.0 |
| Period: | 3.5327313 (± 5.8e-06) d |
| Inclination: | 88.26 (± 0.91) |
| Star: | WASP-22 |
| Mean Radius: | 1.199 |
| Mass: | 0.617 |
WASP-22b, also named Koyopa', is an extrasolar planet orbiting the Sun-like star WASP-22 320pc in the constellation Eridanus.[1] This hot Jupiter has an orbit of 3.53 days and a mass of 0.617 MJ and was detected by transit via SuperWASP. The system is a hierarchical triple system.[2]
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. 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.[3] [4]
The Rossiter-McLaughlin effect -based study in 2011 has determined the planetary orbit is slightly misaligned to the rotational axis of the parent star, with reported angle 22 degrees.[5]