UV spectrum of Enceladus

► Observations of Enceladus from the Cosmic Origins Spectrograph. ► Airglow emissions are found to be relatively low-tens to thousands of Rayleighs. ► Column densities for C assuming solar resonance scattering are 108-1015 cm−2 (depending on assumed source size). ► Reflectance spectrum is consistent with presence of small amount ammonia ice.