Abstract
Abstract Several trace constituents can reach saturation vapor pressure in Pluto’s present-day atmosphere (PDA). As such, we describe a search for discrete cloud features in Pluto’s atmosphere using New Horizons data obtained on 2015 July 14–15, during the Pluto flyby closest approach. We report that the PDA is at least largely (>99% by surface area) free of discrete clouds. We also report a handful of features that may plausibly be clouds, all of which were detected obliquely and at high-phase-angle observing geometry. No cloud candidates were identified away from the terminators or in low-phase (backscattering geometry) images.
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