name Styx
alias The Smallest Light
age old yet young
height 4'10
orientation gender confused
marital single
quirk waving her sword when excited

Upon discovery, Styx received the minor planet designation S/2012 (134340) 1 because it was the first satellite (S) discovered orbiting minor planet (134340) in 2012. It is known informally as "P5", meaning the fifth Plutonian moon to be discovered.

The convention for naming Plutonian moons is to use names associated with the god Pluto in classical mythology. To decide on names for P4 and P5, Mark Showalter and the SETI Institute, on behalf of the discovery team, conducted a non-binding internet poll in 2013, in which the general public was invited to vote for their favorite names. The public could choose from a selection of Greek mythological names related to the god Pluto, or could propose their own names. After the initial announcement, William Shatner, the actor who plays Captain James T. Kirk in the Star Trek franchise, proposed the names Vulcan and Romulus, ostensibly referring to the fire god Vulcan (a nephew of Pluto), and to Romulus the founder of Rome, but also alluding to the fictional planets of Vulcan and Romulus in the Star Trek universe. The 'Romulus' suggestion was discounted, as there is already an asteroid moon of that name, but Vulcan won the poll after Shatner tweeted about it, with Cerberus (the dog that guards Pluto's underworld) coming second and Styx (the goddess of the river of the same name in the underworld) coming third. The winning names were submitted to the International Astronomical Union. However, 'Vulcan' was unacceptable to the IAU because it was not the name of an underworld deity and had already been used for a hypothetical planet inside the orbit of Mercury, as well as having given its name to the vulcanoids.

On 2 July 2013, the IAU announced that it had formally approved the names Styx for P5 and Kerberos for P4.

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