  Saturn's E ring consists of micron-sized particles launched from Enceladus by
that moon's geological activity. A variety of small-scale structures in the
E-ring's brightness have been attributed to tendrils of material recently
launched from Enceladus. However, one of these features occurs at a location
where Enceladus' gravitational perturbations should concentrate background
E-ring particles into structures known as satellite wakes. While satellite
wakes have been observed previously in ring material drifting past other moons,
these E-ring structures would be the first examples of wakes involving
particles following horseshoe orbits near Enceladus' orbit. The predicted
intensity of these wake signatures are particularly sensitive to the fraction
E-ring particles' on orbits with low eccentricities and semi-major axes just
outside of Enceladus' orbit, and so detailed analyses of these and other
small-scale E-ring features should place strong constraints on the orbital
properties and evolution of E-ring particles.
