... Scientists found the ring was orbiting Jupiter in a retrogrademotion, the direction opposite of Jupiter's other rings and ... The reason for this retrogrademotion was unclear. Jupiter may not be the only planet with a tenuous dust ring. ...
... aboard the Galileo spacecraft to determine the quantity and motions of the particles ... particles is that they orbit the planet "retrograde," or the reverse way from the ...
... 104.0 One might also usefully define LEO/R Retrograde: T = 1:26 - 2:00, i = 104.0 - 180.0 LEO/P Polar: T = 1:26 - 2:00, i = 85.0 - 95.0 LEO/E Equatorial T = 1:26 - 2:00, i = 0.0 - 20.0 Of course technically `retrograde' is anything with i more than 90.0 ...