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One of a swarm of minor moons that orbit Jupiter in a retrograde direction (that is, in the opposite direction to Jupiter's own rotation) at a distance of some twenty million kilometres from the planet. This collection of moons is named the Ananke Group after Ananke, its largest member. Orthosie is very much one of the lesser moons of this group, with a diameter of no more than two kilometres. The entire group follows highly inclined orbital paths, and its member moons most likely represent the remains of an asteroid that strayed too close to the giant planet and was shredded to pieces by its gravity.
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