The diagram illustrates the orbital parameters of Margaret , unique among the non-spherical moons of Uranus , with inclination on the vertical axis and the eccentricity of the orbits represented by the segments extending from the pericentre to the apocentre . The diagram illustrates the orbital parameters of Margaret , unique among the irregular satellites of Uranus , with inclination on the vertical axis and the eccentricity of the orbits represented by the segments extending from the pericentre to the apocentre .