Pluto Diameter.... 2,300 km Mass (Earth = 1).... 0.002 Distance in AU's from sun.... 39.53 Rotation period (length of day in Earth days).... 6.4 Revolution period (length of year in Earth years).... 247.7 Mean surface temperature.... -236.0 (C) ... -392.8 (F) Number of moons.... 1 Light minutes from Sun.... 329.3 Light hours from Sun.... 5.5 Photo source:  Space Telescope Science Institute  (Hubble) See credits for original photo information