- Additional Information
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Additional Information
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 - Comments
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