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The International Astronomical Union announced that the fourth and fifth moons of Pluto to be discovered would be named Kerberos and Styx, respectively.

Historical image related to The International Astronomical Union announced that the fourth and fifth moons of Pluto to be discovered would be named Kerberos and Styx, respectively. from July 2, 2013

International Astronomical Union

Association of professional astronomers

The International Astronomical Union is an international non-governmental organization (INGO) with the objective of advancing astronomy in all aspects, including promoting astronomical research, outreach, education, and development through global cooperation. It was founded on…
Source: Wikipedia (CC BY-SA)

Moons of Pluto

Natural satellites orbiting Pluto

The dwarf planet Pluto has five natural satellites. In order of distance from Pluto, they are Charon, Styx, Nix, Kerberos, and Hydra. Charon, the largest, is mutually tidally locked with Pluto, and is massive enough that Pluto and Charon are sometimes considered a binary dwarf…
Source: Wikipedia (CC BY-SA)

Kerberos (moon)

Small natural satellite of Pluto

Kerberos, formal designation (134340) Pluto IV, is a small natural satellite of Pluto, about 19 km (12 mi) in its longest dimension. Kerberos is also the second-smallest moon of Pluto, after Styx. It was the fourth moon of Pluto to be discovered and its existence was announced…
Source: Wikipedia (CC BY-SA)

Styx (moon)

Small natural satellite of Pluto

Styx, formal designation (134340) Pluto V, 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…
Source: Wikipedia (CC BY-SA)