Based on reflectivity estimates, scientists think 2026 ED138 is no smaller than 370 miles across and no more than 930 miles across.
Sources
- Astronomers Just Discovered a New Hidden World Beyond Neptune (nationalgeographic.com)
- https://rubinobservatory.org/news/rubin-first-dwarf-planet-candidate (rubinobservatory.org)
- https://www.washington.edu/news/2026/10/27/rubin-observatory-new-dwarf-planet-candidate/ (washington.edu)
- https://www.cnn.com/2026/10/28/science/ed138-dwarf-planet-candidate-beyond-pluto (cnn.com)
- https://earthsky.org/space/new-dwarf-planet-candidate-ed138/ (earthsky.org)
- https://www.sci.news/astronomy/vera-rubin-observatory-possible-new-dwarf-planet-15166.html (sci.news)
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