The smallest moon of Pluto.

 Kerberos is a small natural satellite of Pluto, about 10km (12mi) in it's longest dimension. The first image of the Kerberos from the flyby was released to the public on 22 October 2015. It was officially designated S/2011(134340) 1, and was informally referred to as P4 (Plutonians fourth moon).Before New Horizons flyby, Kerberos was initially thought to have a larger size and a darker surface.

Facts about Kerberos:-

1. It was fourth moon of the Pluto to be discovered and it's existence was announced on 20 July,2011.

2. Kerberos brightness is only about 10% of that of Nix.

3. Kerberos is a double lobed shape moon.

4. Kerberos has a high albedo or reflectivity because of presence of water ice on the surface.

5. It's alternative name is S/2011(134340) 1, S/2011 P1.

6. It's rotational period of Kerberos was about 5.33 days.

7. It's rotational axis was tilted about 96 degree to it's orbit.