Jupiter (seen with Io) Diameter.... 142,800 km Mass (Earth = 1).... 317.94 Distance in AU's from sun.... 5.2 Rotation period (length of day in Earth hours).... 9.8 Revolution period (length of year in Earth years).... 11.9 Mean surface temperature..... -153.0 (C) ... -243.4 (F) Number of moons.... 16 Light minutes from Sun.... 43.3 Light hours from Sun.... 0.7 Photo source: NASA'S Planetary PhotoJournal See credits for original photo information Observing Tips