Orbital Radii and Eccentricites Planet Mean Orbital Radii (AU) Eccentricity Mercury 0.38710 0.2056 Venus 0.72333 0.0068 Earth 1.00000 0.0167 Mars 1.52369 0.0933 Jupiter 5.20283 0.048 Saturn 9.53876 0.056 Uranus 19.19139 0.046 Neptune 30.06107 0.010 Pluto (ex-planet) 39.52940 0.248 Sources: Cox (2000) ; Planetary Physical Data (Smithsonian National Air and Space Museum)