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Radius: 1,151 km If Earth was the size of a nickel, Pluto would be about as big as a popcorn kernel Mass: 1.3 x 1022 kg Density: 1.92 to 2.06 gm/cc Surface composition: H2O, N2, CH4, CO (all ices) Atmospheric composition: N2, CH4, CO Surface temperature: -232° C Spin period: 6.39 days Orbital period: 248 Earth years Average distance from Sun: 39.5 AU Eccentricity of orbit around Sun: 0.249 Inclination of orbit around Sun: 17.14 degrees |