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

Page compiled: Wed Sep 05 18:38:01 GMT+01:00 2001