2004 XR190 (also written 2004 XR190) is a dwarf-planet candidate located in the scattered disc. Astronomers led by Lynne Jones of the University of British Columbia made the discovery as part of the Canada-France Ecliptic Plane Survey (CFEPS) using the Canada-France-Hawaii Telescope (CFHT). The discovery team has temporarily nicknamed the object "Buffy", after the fictional vampire slayer, and proposed a different official name to the IAU.