Iocaste orbits Jupiter at an average distance of 20,723,000 km in 609.427 days , at an inclination of 147 Â to the ecliptic ( 146 Â to Jupiter 's equator ) with an eccentricity of 0.2874 . Iocaste orbits Jupiter at an average distance of 20,723 Mm in 609.427 days , at an inclination of 147 Â to the ecliptic ( 146 Â to Jupiter 's equator ) with an eccentricity of 0.2874 .