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It was the first of the bodies presently classified as a scattered-disc object (SDO) to be discovered, preceding the SDO prototype by almost a year.
A companion was discovered by Denise C. Stephens and Keith S. Noll, from observations with the Hubble Space Telescope taken on 9 November 2002, and announced on 5 October 2005. The satellite, designated , is relatively large, having a likely mass of about 10% of the primary. Its orbit has not been determined, but it was at a separation of only about 420 kilometres (260 mi) to the primary at the time of discovery, with a possible orbital period of about half a day and an estimated diameter of 161 kilometres (100 mi).
A relative size and distance comparison of the system with the Earth-Moon system. The scale of the Earth-Moon system has been reduced so Earth appears the same size as the primary.