Rubin Observatory spots possible dwarf planet beyond Neptune

The Vera C. Rubin Observatory discovered 2026 ED138 beyond Neptune using observations collected earlier in 2026. The object was about 46 astronomical units from the Sun at the time of the observatory’s announcement, and its estimated size is 600 to 1,500 kilometers across. Infrared observations are needed to refine that estimate and confirm whether it qualifies as a dwarf planet. If confirmed, it would join five recognized dwarf planets.