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| Bulk Parameters | Pluto | Earth | Ratio (Pluto/Earth) |
| Mass (1024 kg) | 0.0125 | 5.9736 | 0.0021 |
| Volume (1010 km3) | 0.715 | 108.321 | 0.0066 |
| Equatorial Radius (km) | 1195 | 6378.1 | 0.187 |
| Polar radius (km) | 1195 | 6356.8 | 0.180 |
| Volumetric mean radius (km) | 1195 | 6371.0 | 0.178 |
| Ellipticity | 0.0000 | 0.00335 | 0.0 |
| Mean density (kg/m3) | 1750 | 5515 | 0.317 |
| Surface gravity (eq.) (m/s2) | 0.58 | 9.78 | 0.059 |
| Escape velocity (km/s) | 1.1 | 11.19 | 0.0983 |
| GM (x 106 km3/s2) | 0.00083 | 0.3986 | 0.0021 |
| Bond albedo | 0.145 | 0.306 | 0.474 |
| Visual geometric albedo | 0.3 | 0.367 | 0.817 |
| Visual magnitude V (1,0) | -1.0 | -3.86 | - |
| Solar irradiance (W/m2) | 0.89 | 1367.6 | 0.0007 |
| Black-body temperature (K) | 42.7 | 254.3 | 0.168 |
| Orbital Parameters | Pluto | Earth | Ratio (Pluto/Earth) |
| Semimajor axis (106 km) | 5869.66 | 149.60 | 39.236 |
| Sidereal orbit period (days) | 90465 | 365.256 | 247.68 |
| Tropical orbit period (days) | 90588 | 356.242 | 248.02 |
| Perihelion (106 km) | 4434.99 | 147.09 | 30.152 |
| Aphelion (106 km) | 7304.33 | 152.10 | 48.023 |
| Synodic period (days) | 366.73 | - | - |
| Mean orbital velocity (km/s) | 4.72 | 29.79 | 0.158 |
| Max. Orbital Velocity (km/s) | 6.10 | 30.29 | 0.201 |
| Min. orbital velocity (km/s) | 3.71 | 29.29 | 0.127 |
| Orbital inclination (deg) | 17.16 | 0.00 | - |
| Orbit eccentricity | 0.2444 | 0.0167 | 14.635 |
| Sidereal rotation period (hrs) | -153.2928 | 23.9345 | 6.405 |
| Obliquity to orbit (deg) | 122.53 | 23.45 | (2.451) |
| Observational Parameters | |||
| Discoverer: | Clyde Tombaugh | ||
| Discovery Date: | 18 Feb. 1930 | ||
| Apparent diameter from Earth | Maximum | 0.11 | |
| (seconds of arc): | Minimum | 0.06 | |
| Distance from Earth | Maximum | 7533.3 | |
| (106 km): | Minimum | 4293.7 | |
| Mean values at opposition from Earth: | Distance from Earth: 5750.54 x 10^6 km | Apparent diameter (seconds of arc): 0.08 | Apparent Visual magnitude: 15.1 |
| Mean Orbital Elements (J200) | Pluto | ||
| Semimajor axis (A.U.) | 39.48168677 | On 11 Febuary 1999, at 11:22 U.T. (6:22 A.M. E.S.T.), Pluto passed Neptune as the furthest planet from the Sun once again and will remain so until 5 April 2231. | |
| Orbital eccentricity | 0.24880766 | ||
| Orbital inclination (deg) | 17.14175 | ||
| Longitude of ascending node | 110.30347 | ||
| Longitude of perihelion (deg) | 224.06676 | ||
| Mean Longitude (deg) | 238.92881 | ||
| Atmosphere | |||
| Surface Pressure | ~3 microbar | ||
| Scale Height | ~60 km | ||
| Average temperature | ~ 50 K | ||
| Mean molecular weight | ~16-25 g/ mole | ||
| Atmospheric Composition: | Methane (CH4) | Nitrogen (N2) | |
| Charon Facts: | |||
| Mean distance from Pluto (km) | 19,600 | ||
| Sidereal orbit period (days) | 6.38725 | ||
| Sidereal rotation period (hrs) | 6.38725 | ||
| Orbital inclination to Pluto | (deg) 0.0 | ||
| Orbit eccentricity | 0.0 | ||
| Equatorial Radius (km) | 593 | ||
| Mass (1021 kg) | 1.9 | ||
| Mean density (kg/m3) | 2000 | ||
| Surface gravity (eq.) (m/s2) | 0.21 | ||
| Escape velocity (km/s) | 0.58 | ||
| Albedo | 0.5 | ||
| Apparent Visual magnitude | 16.8 | ||
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Fact sheet source from NSSDC/NASA |