The Second Ring-Moon System of Uranus: Discovery and Dynamics

@article{Showalter2006TheSR,
  title={The Second Ring-Moon System of Uranus: Discovery and Dynamics},
  author={Mark R. Showalter and Jack J. Lissauer},
  journal={Science},
  year={2006},
  volume={311},
  pages={973 - 977}
}
Deep exposures of Uranus taken with the Hubble Space Telescope reveal two small moons and two faint rings. All of them orbit outside of Uranus's previously known (main) ring system but are interior to the large, classical moons. The outer new moon, U XXVI Mab, orbits at roughly twice the radius of the main rings and shares its orbit with a dust ring. The second moon, U XXVII Cupid, orbits just interior to the satellite Belinda. A second ring falls between the orbits of Portia and Rosalind, in a… 
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    Philosophical Transactions of the Royal Society A
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RESONANCES, CHAOS, AND SHORT-TERM INTERACTIONS AMONG THE INNER URANIAN SATELLITES
The Portia group of Uranian satellites, representing 9 of the planet’s 13 tiny innermost moons, form a densely packed dynamical system. Hubble Space Telescope observations indicate that their orbits
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