  The Voyager 2 Radio Science Subsystem occultations of the Uranian alpha and
beta rings exhibit quasi-periodic optical depth variations with radial
wavelengths that vary with longitude. These patterns may be wakes from small
moonlets orbiting exterior to these rings. Based on the observed structures in
the rings, we estimate that the moonlets would need to be located about 100 km
exterior to the rings' semimajor axes and be 2-7 km in radius. Such moonlets
could help keep the rings confined. Due to their small radii and presumed low
albedo, the expected brightness of these moonlets is on the order of the noise
in Voyager 2 images.
