Kerberos

Kerberos was discovered in 2011 using the Hubble Space Telescope. This relatively small moon, with an estimated diameter of about 19 kilometers (12 miles), orbits Pluto at an average distance of approximately 58,000 kilometers (36,000 miles) from the dwarf planet. Its name, Kerberos, draws from Greek mythology, representing Cerberus, the three-headed dog guarding the underworld. Kerberos, like its peers, is locked in a 3:2 orbital resonance with Charon, contributing to the gravitational dynamics of the Pluto-Charon system.