Sponsored by the Institute of Physics   Planets   Mercury   Venus   Earth   Mars   Jupiter   Saturn   Uranus   Neptune   Pluto     Charon Asteroids Comets Constellations Sunrise and Sunset Times Moon Phases SI Units Symbols   Printer Version Astronomy Planets - Pluto Bulk Parameters | Orbital Parameters Observational Parameters | Atmospheric Parameters Satellites Bulk Parameters Mass 0.012 5 × 1024 kg Volume 0.616 × 1010 km3 Volumetric Mean Radius 1 137 km Mean Density 2 050 kg m-3 Surface Gravity (At Pressure = 1 bar) 0.66 m s-2 Escape Velocity 1.1 km s-1 GM 0.000 83 × 106 km3 s-2 Bond Albedo 0.145 Visual Geometric Albedo 0.3 Solar Irradiance 0.9 W m-2 Black-Body Temperature 42.7 K Orbital Parameters Semimajor Axis 5 906.4 × 106 km Sidereal Orbit Period 90 465 days Tropical Orbit Period 90 588 days Perihelion 4 445.8 × 106 km Aphelion 7 381.2 × 106 km Synodic Period 366.73 days Mean Orbital Velocity 4.75 km s-1 Orbital Inclination 17.14 ° Orbital Eccentricity 0.248 8 Sidereal Rotation Period 153.292 8 hours Obliquity to Orbit 122.46 ° Observational Parameters Maximum Apparent Diameter from Earth 0.11 arc seconds Minimum Apparent Diameter from Earth 0.06 arc seconds Maximum Distance from Earth 7533.3 × 106 km Minimum Distance from Earth 4293.7 × 106 km Apparent Magnitude near Opposition 15.1 Atmospheric Parameters Surface Pressure about 3 µbars Average Temperature about 50 K Scale Height about 60 km Mean Molecular Weight 16 g mol-1 to 25 g mol-1 Methane CH4 Uncertain Amount Nitrogen N2 Uncertain Amount Satellites Charon   [ H O M E ] [ S C I E N C E ] [ M A T H S ] [ A S T R O N O M Y ] Download | Shop | Contact | About   Page compiled: Wed Sep 05 18:38:01 GMT+01:00 2001