Orbit orientation of WASP-117b and the expected equilibrium temperature, assuming albedo α = 0 and tofirst-order instant adjustment of atmospheric temperature to changes of incoming stellar flux as used in Lendl et al. (2014). Temperatures about 1000 K for solar metallicity denote the transition in equilibrium chemistry between CO (for the hot regime T_eq ≳ 1000 K) and CH₄ (for the warm T_eq ≲ 1000 K) (Crossfield 2015). In the latter case, however, formation of CH₄ is expected to be quenched because of disequilibrium chemistry. The planet is expected to remain 4.6 days in the hot regime and 5.4 days in the colder regime.