Thyone is about 4 kilometres in diameter , and orbits Jupiter at an average distance of 21,406,000 km in 639.803 days , at an inclination of 147 Â to the ecliptic ( 147 Â to Jupiter 's equator ) with an eccentricity of 0.2526 . Thyone is about 4 kilometres in diameter , and orbits Jupiter at an average distance of 21,406 Mm in 639.803 days , at an inclination of 147 Â to the ecliptic ( 147 Â to Jupiter 's equator ) with an eccentricity of 0.2526 .