radius ( AU ) Orbital period (years) [a] Inclination to Sun's equator (°) Orbital eccentricity Rotation period (days) Confirmed moons [c] Rings Atmosphere Terrestrial planet Mercury 0.382 0.06 0.39 0.24 3.38 0.206 58.64 0 no minimal Venus 0.949 0.82 0.72 0.62 3.86 0.007 −243.02 0 no CO 2 , N 2