The largest of the trans-Neptune dwarf planets is Eris, which is supposed to have a diameter of 1,850 miles. Its period is 560 years (vs. 248 years for Pluto), but at times it is closer to the sun than Pluto is. Its name means "strife." It has one known satellite, Dysnomia, which means "lawlessness" in Greek.
The other dwarf planets further out than Pluto are Haumea and Makemake.
thanx, Verg!