Similar with Triton
It has a retrograde orbit, but is synchronous with Neptune. Eventually it will reach the Roche Limit and be destroyed by gravitational forces.
What will happen to Phoebe?
New analysis of images of Phoebe, one of Saturn's many moons, suggests it may be have started life as a planetoid in the Kuiper belt. A paper in the April issue of Icarus suggests that after study with what NASA describes as “data from multiple spacecraft instruments and a computer model of the moon's chemistry, geophysics and …