The diagram illustrates the orbital parameters of the retrograde non-spherical moons of Uranus ( in polar co-ordinates ) with the eccentricity of the orbits represented by the segments extending from the pericentre to the apocentre . The diagram illustrates the orbital parameters of the retrograde irregular satellites of Uranus ( in polar co-ordinates ) with the eccentricity of the orbits represented by the segments extending from the pericentre to the apocentre .