Neptune Stats

Planet Profile Mass (kg)¤1.02 x 10^26 Diameter (km)¤49528 Mean density (kg/m^3)¤1640 Escape velocity (m/sec)¤23300 Average distance from Sun (AU)¤30.06 Rotation period (length of day in Earth hours)¤19.1 Revolution period (length of year in Earth years)¤164.8 Obliquity (tilt of axis in degrees)¤29.6 Orbit inclination (degrees)¤1.77 Orbit eccentricity (deviation from circular)¤0.009 Mean temperature (K)¤48 Visual geometric albedo (reflectivity)¤0.51 Atmospheric components¤74% hydrogen, 25% helium, 1% methane (at depth) Rings¤Rings are narrow, and contain concentrations of particles called ring arcs.