As of the discovery announcement, there were only five dwarf planets formally recognized by the International Astronomical Union: Pluto, Ceres, Eris, Haumea, and Makemake.
Sources
- Astronomers Just Discovered a New Hidden World Beyond Neptune (nationalgeographic.com)
- https://www.planetary.org/articles/meet-the-dwarf-planets (planetary.org)
- https://science.nasa.gov/solar-system/planets/ (science.nasa.gov)
- https://www.rmg.co.uk/stories/space-astronomy/dwarf-planets-pluto-ceres-haumea-makemake-eris (rmg.co.uk)
- https://gizmodo.com/rubin-observatory-spots-possible-dwarf-planet-beyond-pluto-the-biggest-in-20-years-2000831865 (gizmodo.com)
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