Discovery of new extreme trans-Neptunian (TNO) object 2017 OF201.

Large enough at 700 km diameter to qualify as a dwarf planet. Orbit with aphelion of 1,632 AU extends to the inner Oort cloud and covers a region where few extreme TNOs have been detected.

The study used archival data from the Dark Energy Camera Legacy Survey DECaLS using the 4-meter Blanco telescope at the Cerro Tololo Inter-American Observatory in Chile.

https://arxiv.org/pdf/2505.15806
https://en.wikipedia.org/wiki/Extreme_trans-Neptunian_object
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