Orbits of shepherd satellites deduced from the structure of the rings of Uranus

  title={Orbits of shepherd satellites deduced from the structure of the rings of Uranus},
  author={Carl D. Murray and Robert P. Thompson},
The sharp edges of the rings of Uranus require the presence of small satellites to halt radial spreading. There are several key locations in the ring system where satellites would be most effective at confining rings. Some of these are close to resonances with the moon Cordelia, and there is indirect evidence for the existence of at least two of these satellites. 
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The Dynamics of Planetary Rings and Small Satellites
All the giant outer planets of the solar system possess ring systems, each with an accompanying retinue of small satellites. Although the ring systems of Jupiter, Saturn, Uranus and Neptune have
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Planetary ring dynamics
  • C. Murray
  • Physics, Geology
    Philosophical Transactions of the Royal Society of London. Series A: Physical and Engineering Sciences
  • 1994
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The last few decades have seen an avalanche of observations of planetary ring systems, both from spacecraft and from Earth. Meanwhile, we have seen steady progress in our understanding of these
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The rings in the solar system and the mathematical and physical approaches to understanding them are described. The variety of ring phenomena revealed in recent years from space and earth-based
Dusty Rings and Circumplanetary Dust: Observations and Simple Physics
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We identify several orbital resonances involving the newly discovered satellites, 1986U7 and 1986U8, and the Uranian rings. The most important resonances in eccentric rings are known as eccentric
Shepherding of the Uranian Rings. II. Dynamics
We explore the dynamical significance of the orbital resonances, identified in Paper I (Porco and Goldreich 1987), involving the satellites 1986U7 and 1986U8, and the є, δ, and y rings. We
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IT has been suggested1,2 that small satellites of diameter less than 50 km (moonlets) could exist within planetary rings, and could cause 'grooves' of low density in the adjacent ring material. Here
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