Pluto is given an asteroid number by Minor Planet Center, the official organization responsible for collecting data about asteroids and comets in our solar system.. Its number is 134340. Furthermore, 2003 UB313, was formerly named Xena, is given the number 136199.
About the 2003 UB313, it’s most probably will be named by IAU as Eris. Eris was the goddess of strife and discord. The moon of Eris, was formerly known as Gabrielle, is now Dysnomia, the goddess of lawlessness.
You may check about the Greek Gods in this website, Theoi.
