Planet Pluto
Discovered by Clyde W. Tombaugh Date of discovery February 18, 1930 Mass (kg) 1.27e+22 Mass (Earth = 1) 2.125e-03 Equatorial radius (km) 1,137 Equatorial radius (Earth = 1) 0.1783 Mean density (gm/cm^3) 2.05 Mean distance from the Sun (km) 5,913,520,000 Mean distance from the Sun (Earth = 1)) 39.5294 Rotational period (days) -6.3872 Orbital period (years) 248.54 Mean orbital velocity (km/sec) 4.74 Orbital eccentricity 0.2482 Tilt of axis (degrees) 122.52 Orbital inclination (degrees) 17.148 Equatorial surface gravity (m/sec^2) 0.4 Equatorial escape velocity (km/sec) 1.22 Visual geometric albedo 0.3 Magnitude (Vo) 15.12 Atmospheric composition: Methane, Nitrogen 0.3 
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