Kalyke is about 5.2 kilometres in diameter , and orbits Jupiter at an average distance of 23,181,000 km in 721.021 days , at an inclination of 166 Â to the ecliptic ( 165 Â to Jupiter 's equator ) , with an eccentricity of 0.2140 . Kalyke is about 5.2 kilometres in diameter , and orbits Jupiter at an average distance of 23,181 Mm in 721.021 days , at an inclination of 166 Â to the ecliptic ( 165 Â to Jupiter 's equator ) , in a retrograde direction and with an eccentricity of 0.2140 .