Aitne is about 3 kilometres in diameter , and orbits Jupiter at an average distance of 22,285,000 km in 679.641 days , at an inclination of 166 Â to the ecliptic ( 164 Â to Jupiter 's equator ) , with an eccentricity of 0.393 . Aitne is about 3 kilometres in diameter , and orbits Jupiter at an average distance of 22,285 Mm in 679.641 days , at an inclination of 166 Â to the ecliptic ( 164 Â to Jupiter 's equator ) , in a retrograde direction and with an eccentricity of 0.393 .