D ione ( "dy OH nee" ) is the twelfth of Saturn 's known satellites: orbit : 377,400 km from Saturn diameter : 1120 km mass : 1.05e21 kg I n Greek mythology Dione was the mother of Aphrodite (Venus) by Zeus (Jupiter). ... Both rotate synchronously and have dissimilar leading and trailing hemispheres. ... H elene orbits in Dione's leading Lagrange point. more images . ... H elene is in Dione's leading Lagrange point and hence was sometimes refered to as "Dione B". from LANL . ... Saturn .. ...

Rhea . ... Rhea is an icy body with a density of 1.33 gm/cm 3 . The low density indicates that it is composed of a rocky core taking up less than one-third of the moon's mass, with the rest composed of water-ice. ... Rhea is heavily cratered with bright whispy markings. ... The second area, in parts of the polar and equatorial regions, has craters under 40 kilometers (25 miles) in diameter. ... Orbital period (days) . ... Credit: Calvin J. Hamilton) . ... Copyright ї 1997 by Calvin J. Hamilton . ...

... gradients dependencies on solar wind parameters and IMF; . ... fate of thermal plasma at the dayside magnetopause. velocity-dispersed injections of the thermal and superthermal ions from LLBL at cusp and cleft (lowest energy VDIS-2 events); . ... outer cusp processes, role of outer cusp indentation, plasma entry (laminar reconnection, turbulent diffusion, others), role of turbulent boundary layer; . how is the magnetosheath plasma heated near magnetopause and cusp? . ... cusp/cleft wave emissions. ...