Iocaste orbits Jupiter at an average distance of 20,723 Mm in 609.427 days, at an inclination of 147° to the ecliptic (146° to Jupiter's equator) with an eccentricity of 0.2874.
Luno Jokasta je leta 2000 odkrila skupina astronomov, ki jo je vodil Scott S. Sheppard z Univerze Havajev.