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| | AllRefer.com - Dione, in astronomy (Astronomy, General) - Encyclopedia |
 | | Also known as Saturn IV (or S4), Dione is 695 mi (1,120 km) in diameter, orbits Saturn at a mean distance of 234,500 mi (377,400 km), and has an orbital period of 2.737 earth days : the rotational period is unknown but is assumed to be the same as the orbital period. |
 | | Another moon, Helene, is co-orbital with Dione; that is, it orbits Saturn at the same distance as Dione, and precedes Dione by about 60°. |
 | | Dione also forms a satellite pair with Enceladus; that is, the two moons interact gravitationally. |
| reference.allrefer.com /encyclopedia/D/DioneAst.html (297 words) |
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