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Time Variability in the Outer Edge of Saturn's A-Ring Revealed by Cassini Imaging

Porco, C. C.; Spitale, J. N.

We examine the outer edge of Saturn's A-ring, whose shape is strongly influenced by the co-orbital satellites Janus and Epimetheus, during the period from day 2005-121 to day 2009-036. Twenty-four Cassini imaging data sets are used, each one giving a picture of the ring during a short interval, allowing us to explore its time variability in detail…