Planet Profile Neptune

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) (degrees)...........................................29.6
Orbit inclination (degrees)...................................................1.77
Orbit eccentricity.................................................................0.009
Mean temperature (K)..............................................................48
Visual geometric albedo.....................................................0.51

Atmospheric components.....74% hydrogen, 25% helium, 1% methane (at depth)
Rings........... are narrow, and contain concentrations of particles called ring arcs.