3.3.8 What's in a name?
The naming of S/2011 P1 and S/2012 P1 was open to an internet poll where the names ‘Vulcan’ and ‘Romulus’ won. However, the International Astronomical Union (IAU) could not accept these names. Romulus is already used for the moon of the asteroid 87 Sylvia. Vulcan is not connected with the underworld theme that has been adopted for Pluto, and has been used to name the (hypothetical) vulcanoid asteroids. In the end, S/2011 P1 was named Kerberos, a Greek spelling of Cerberus, the dog that guarded the mythological underworld. S/2012 P1 was named Styx, after the river that bordered the underworld.