Dione

Wikipedia: Dione (moon) - Wikipedia
Discovered by Giovanni Cassini in 1684

Orbital size 377,400 km (approximately 235,000 miles)

Orbital eccentricity 2%

Orbital inclination 0 degrees

Orbital period 2.73691 days

Rotation period 2.73691 days (synchronous rotation, one side permanently facing Saturn)

Diameter 1120 km (about 700 miles)

Mass 1/5500 of Earth, 1/70 of Earth's Moon

Surface gravity 2% of Earth, 1/7 of Earth's Moon

Density 1.4 times density of water (Composition probably 2/3 ice, 1/3 rock)

Albedo (reflectivity) 70%

Surface temperature ca. -186 Celsius

Traps Helene at its leading Lagrangian point

Population: ca. 52000

First Manned Mission: *
First Permanent Colony: *