Dione

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Dione
Dione is a moon of Saturn. It is named after the Titaness Dione of Greek mythology. At 1122 km in diameter, Dione is the 15th largest moon in the Solar System, and is more massive than all known moons smaller than itself combined. About two thirds of Dione's mass is water ice, and the remaining is a dense core, probably silicate rock. Dione has two co-orbital, or trojan, moons, Helene and Polydeuces. They are located within Dione's Lagrangian points L4 and L5, 60 degrees ahead of and behind Dione respectively. Dione (moon) - Wikipedia, the free encyclopedia
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Short Description Dione is a moon of Saturn. It is named after the Titaness Dione of Greek mythology. At 1122 km in diameter, Dione is the 15th largest moon in the Solar System, and is more massive than all known moons smaller than itself combined. About two thirds of Dione's mass is water ice, and the remaining is a dense core, probably silicate rock. Dione has two co-orbital, or trojan, moons, Helene and Polydeuces. They are located within Dione's Lagrangian points L4 and L5, 60 degrees ahead of and behind Dione respectively. Dione (moon) - Wikipedia, the free encyclopedia
Discovered by Giovanni Cassini
Discovery date March 21, 1684
Type Moon
AddInfo Saturn IV
Satellite of Saturn
Orbit Prograde
Rotation Synchronous
Atmosphere Trace
Shape Equilibrium spheroid
Apoapsis 06 378 260 km
Periapsis 06 376 580 km
Semi-major axis 06 377 396 km
Distance from Sun 01 9.554 909 au /18
Eccentricity 0.002 2
Orbital period 2.736 915 days
Orbital speed 02 10,03 km/s
Inclination to the equator 000.019°
Diameter/Size 04 1123.4 ± 0.9 km
Dimensions 1128.8  ×  1122.6  × 1119.2 km
Mass 1021×1.095 452 kg
Density 01 1.478 g/cm3
Surface gravity  0.232 m/s2
Escape velocity 03 510 m/s
Rotation period 2.736 915 days
Axial tilt 000.006°
Albedo Bond 0.55
Albedo geometric 0.998
Temperature mean 02 87 K | −186°C
Apparent magnitude 10.4
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