(The second value represents the quantity as a fraction of the terrestrial value.)
Mass 12.5e21 kg 0.0021 GM 830 km3/s2 0.0021 Volumetric mean radius 1137 km 0.1785 Mean density 2050 kg/m3 0.3714 Surface gravity 0.66 m/s2 0.0675 Escape velocity 1.1 km/s 0.0983
Semimajor axis 5.9135e9 km 39.53 Sidereal period 90,465 d 247.68 Tropical period 90,588 d 248.02 Eccentricity 0.2482 14.862 Inclination 17.15 deg Synodic period 366.73 d Mean orbital velocity 4.75 km/s 0.1594 Perihelion 4.4458e9 km 30.22 Aphelion 7.3812e9 km 48.53
Bond albedo 0.145 0.377 Visual geometric albedo 0.3 0.817 Solar irradiance 0.9 W/m2 0.0007 Black-body temperature 42.7 K 0.1653
Epoch 1994.0 North pole (RA and Dec) 312.95 deg / 9.07 deg Obliquity 122.51 deg Argument of prime meridian 331.16 deg at epoch Sidereal rotation rate -56.3623195 deg/d Sidereal rotation period 6.3872 d
Surface pressure ~3 microbar Average temperature ~50 K Scale height ~60 km Mean molecular weight ~16 to 25 g/mol Composition: Methane (CH4) Nitrogen (N2)
Epoch JD 2449360.5 Mean distance 39.831 AU Eccentricity 0.2553 Inclination 17.13 deg Longitude of ascending node 110.33 deg Longitude of perihelion 224.22 deg Mean longitude at epoch 230.21 deg
Mean distance from Pluto 19,405 km Sidereal orbit period 6.387 d Orbital inclination 96.56 deg Orbital eccentricity 0.0 Equatorial radius 586 km Mass 1.7e21 kg Mean density 1800 kg/m3 Surface gravity 0.21 m/s2 Escape velocity 0.58 km/s Albedo 0.375