WASP-22b

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

WASP-22b / Koyopa'

A comparison between the sizes of WASP-22b (right) and Jupiter
Discovery
Discovered by	Maxted, et al.
Discovery site	South African Astronomical Observatory
Discovery date	Published December 2010
Detection method	Transit photometry
Orbital characteristics
Epoch J2000
Semi-major axis	0.04698 (± 0.00037) AU
Eccentricity	0.0
Orbital period (sidereal)	3.5327313 (± 5.8e-06) d
Inclination	88.26 (± 0.91)
Star	WASP-22
Physical characteristics
Mean radius	1.199 RJ
Mass	0.617 MJ
Temperature	1298 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-based study in 2011 has determined the planetary orbit is slightly misaligned with the rotational axis of the parent star, with a reported angle of 22±16 degrees.^[8]