Styx

Styx is a small natural satellite of Pluto whose discovery was announced on 11 July 2012. It was discovered by use of the Hubble Space Telescope, and is the smallest of the five known moons of Pluto. 
It was imaged along with Pluto and Pluto's other moons by the New Horizons spacecraft in July 2015, albeit poorly with only a single image of Styx obtained.
Styx is the second-closest known satellite to Pluto, and the fifth discovered. It was discovered one year after Kerberos. Styx is approximately 16 km (9.9 mi) across its longest dimension, and its orbital period is 20.1 days.
Category:Plutonian Moons
Category:Moons
Category:Objects Not in Hydrostatic Equilibrium
Category:Objects with No Atmosphere
Category:Kuiper Belt Object
Category:Dwarf Planet Moon
Category:Prograde Satellite
Category:Objects Visited by Spacecraft