Hello Hydra!

Explanation: Using its Long Range Reconnaissance Imager (LORRI), New Horizons made its first detection of Pluto's small, faint, outermost known moon, Hydra. The images were taken to practice the long-exposure mosaics that the New Horizons team will use to search for additional moons and potentially hazardous debris near Pluto as the spacecraft approaches the Pluto system in May and June 2015.

Pluto

Image credit: NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute.