Jupiterís outermost satellites

Jupiterís outermost satellites

. Eight satellites of Jupiter have eccentric orbits that are inclined with respect to Jupiterís equatorial plane. The inner group of four moves around Jupiter in conventional direct orbits, in the same direction that the planet orbits the Sun, at distances between 11 and 12 billion (1.1 and 1.2 x 1010) meters. Their names all end in the letter "a" - Leda, Himalia, Lysithea, and Elara. The outer group of four has backward retrograde orbits that lie at distances between 20 and 24 billion (2.0 and 2.4 x 1010) meters from Jupiter. The outer group has names ending in "e" - Ananke, Carme, Pasiphae, and Sinope. In contrast, the four Galilean satellites, which are relatively near to the planet, move with direct orbits close to the planet's equatorial plane, as do four smaller satellites that are even closer to Jupiter.

Copyright 2010, Professor Kenneth R. Lang, Tufts University