Astronomers find possible new dwarf planet 2026 ED138

Astronomers at the Vera C. Rubin Observatory in Chile spotted object 2026 ED138, roughly 600–1,500 km across and about 46 AU from the Sun. It may be one of the largest and brightest known dwarf planet candidates, though its status is not yet confirmed.

• Estimated diameter is 600–1,500 km at a distance of about 46 AU
• Matthew Holman identified the object on October 13 in Rubin's 2026 data
• Archival images back to 2016 let the team reconstruct a decade of its orbit
• Confirming dwarf planet status requires a more precise size and shape measurement