Epimetheus is co-orbital with Janus. A faint dust ring is associated with the two moons.
Epimetheus has dimensions of 129.8x114x106.2 km with a period of rotation of 0.694 333 517 days. Planned flybys span the mission with close approaches on Dec 3,2007 and Oct 1, 2011.
See 
Small Satellites Events (
xlsx, 
txt) observing log including range, flyby velocity and phase
 
For observation times and instruments compare Small Satellites Events file with 
Master Schedule under Epimetheus.
  
Observations were made by:
CIRS - Composite Infrared Spectrometer
ISS - Imaging Science Subsystem
UVIS - Ultraviolet Imaging Spectrograph
VIMS - Visual and Infrared Mapping Spectrometer