Orthosie is about 2 kilometres in diameter , and orbits Jupiter at an average distance of 20,568,000 km in 602.619 days , at an inclination of 142 Â to the ecliptic ( 143 Â to Jupiter 's equator ) , with an eccentricity of 0.2433 . Orthosie is about 2 kilometres in diameter , and orbits Jupiter at an average distance of 20,568 Mm in 602.619 days , at an inclination of 142 Â to the ecliptic ( 143 Â to Jupiter 's equator ) , in a retrograde direction and with an eccentricity of 0.2433 .