(48639) 1995 TL8
Discovery. was discovered on 15 October 1995, by American astronomer Arianna Gleason as part of UA's Spacewatch survey at Kitt Peak National Observatory, near Tucson, Arizona. 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. Satellite. 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 to the primary at the time of discovery, with a possible orbital period of about half a day and an estimated diameter of . Scattered–extended object. is classified as detached object (scattered–extended) by the Deep Ecliptic Survey, since its orbit appears to be beyond significant gravitational interactions with Neptune's current orbit. However, if Neptune migrated outward, there would have been a period when Neptune had a higher eccentricity. Simulations made in 2007 show that appears to have less than a  1% chance of being in a 3:7 resonance with Neptune, but it does execute circulations near this resonance. Numbering and naming. This minor planet was numbered by the Minor Planet Center on 20 November 2002. As of 2018, it has not been named.