The closest flyby of Tethys was on Sept 24 2005.
CDA - Cosmic Dust Analyzer
CIRS - Composite Infrared Spectrometer
ISS - Imaging Science Subsystem
Radar - a Radar instrument
RPWS - Radio and Plasma Wave Spectrometer
RSS - Radio Science Subsystem
UVIS - Ultraviolet Imaging Spectrograph
VIMS - Visual and Infrared Mapping Spectrometer