Jupiter
Equatorial Diameter: 71,400 km (11x Rearth)
Mass: 1.9x1027 kg (320x Mearth)
Distance from Sun: 5.2 AU
Rotation period: 9.8
hours
Visited by:
- Pioneer 10 & 11 (1973)
- Voyager 1 & 2 (1979)
- Galileo (now)
Jupiter has a very faint ring system, and an abundance
(>60 and counting...) of moons, mostly small. The largest (Io,
Europa, Ganymede, and Callisto) were discovered by Galileo, and can be
seen through binoculars or a small telescope.