Pluto, measured by NASA's New Horizons during its July 2015 flyby, has a diameter of about 2,377 km, making it the largest known dwarf planet by size — slightly larger than Eris, although Eris is about 27% more massive.
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Pluto, measured by NASA's New Horizons during its July 2015 flyby, has a diameter of about 2,377 km, making it the largest known dwarf planet by size — slightly larger than Eris, although Eris is about 27% more massive.
The largest diameter of any recognized dwarf planet.
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Limits Registry. LR-LARGEST-DWARF-PLANET-DIAMETER. Largest dwarf planet by diameter. 2026.