Simplify the following text for a Grade 8 native English-speaking person.
Original: is about 2 kilometres in diameter , and orbits Jupiter at an average distance of 29,540,000 km in 980 days , at an inclination of 154 Â to the ecliptic ( 152 Â to Jupiter 's equator ) and with an eccentricity of 0.2255 .
Simplified: is about 2 k in diameter , and orbits Jupiter at an average distance of 29.54 G in 981.55 days , at an inclination of 154 Â to the ecliptic ( 152 Â to Jupiter 's equator ) and with an eccentricity of 0.2255 .