In September 2006 it was reduced to a number--number 134340 in the catalog of minor planets
The IAU 
subsequently added Eris to its Minor Planet Catalogue, designating it (136199)... [DOC] [TLE] 2003 UB313 Xena - Crystalinks [PAR] Some astronomers believe that there are large numbers of undiscovered TNOs 
as large as or larger than Pluto.