Simplify the following text for a Grade 9 native English-speaking person.
Original: is about 2 km in diameter , and orbits Jupiter at an average distance of 23,571 Mm in 739.294 days , at an inclination of 147 Â to the ecliptic ( 149 Â to Jupiter 's equator ) , in a retrograde direction and with an eccentricity of 0.3003 .
Simplified: is about 2 km in diameter , and orbits Jupiter at an average distance of 23,571,000 km in 739.294 days , at an inclination of 147 Â to the ecliptic ( 149 Â to Jupiter 's equator ) , with an eccentricity of 0.3003 .