Thelxinoe is about 2 kilometres in diameter , and orbits Jupiter at an average distance of 20,454,000 km in 597.607 days , at an inclination of 151 Â to the ecliptic ( 153 Â to Jupiter 's equator ) , with an eccentricity of 0.2685 . Thelxinoe is about 2 kilometres in diameter , and orbits Jupiter at an average distance of 20,454 m in 597.607 days , at an inclination of 151 Â to the ecliptic ( 153 Â to Jupiter 's equator ) , in a retrograde direction and with an eccentricity of 0.2685 .