Basic data for Pluto

Basic data for Pluto

▪ Table
Basic data for Pluto
mean distance from Sun 5,910,000,000 km (39.5 AU)
eccentricity of orbit 0.251
inclination of orbit to ecliptic 17.1°
Plutonian year (sidereal period of revolution) 247.69 Earth years
visual magnitude at mean opposition 15.1
mean synodic period* 366.74 Earth days
mean orbital velocity 4.72 km/s
radius 1,172 km
mass 1.2 x 1022 kg
mean density about 2 g/cm3
mean surface gravity 58 cm/s
escape velocity 1.1 km/s
rotation period (Plutonian sidereal day) 6.3873 Earth days (retrograde)
Plutonian mean solar day** 6.3874 Earth days
inclination of equator to orbit (obliquity) 120°
mean surface temperature about 40 K (-387 °F, -233 °C)
surface pressure (near perihelion) about 10-5 bar
number of known moons 3
*Time required for Pluto to return to the same position in the sky relative to the Sun as seen from Earth.
**Smallness of deviation from sidereal day is due to Pluto's huge orbit.
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Universalium. 2010.

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