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Far ultraviolet observations of comets yield information about the energeticprocesses that dissociate the sublimated gases from their primitive surfaces.Understanding which emission processes are dominant, their effects on theobserved cometary spectrum, and how to properly invert the spectrum back tocomposition of the presumably pristine surface ices of a comet nuclei are allcritical components for proper interpretation and analysis of comets. The closeapproach of comet 46P/Wirtanen in 2018-2019 provided a unique opportunity tostudy the inner most parts of a cometary coma with the Hubble Space TelescopeCosmic Origins Spectrograph, rarely accessible with remote observations, atlength scales (100's of km) and wavelengths (900-1430 Angstroms) previouslyprobed only by the European Space Agency's Rosetta spacecraft. Our observationsshow a complex picture for the inner coma; atomic production rates for H and Othat show water is the dominant source of both, an abundance of atomic sulfurthat is difficult to explain with the lifetimes of common sulfur parentmolecules, and a density distribution that is poorly fit with both Haser andvectorial models.

FUV Observations of the Inner Coma of 46P/Wirtanen