Searching for Charon's Atmosphere

There has been no compelling evidence to date for an atmosphere around Charon. However, New Horizons' successful flyby of the Pluto-Charon system provides orders of magnitude more sensitivity to detection of even a very tenuous Charon atmosphere. In particular, the Alice ultraviolet spectrograph acquired measurements of both reflected sunlight from Charon on approach of the system, as well as observing an occultation of the sun during departure through Charon's shadow. We will present the results from Alice and our analysis of these Charon observations.