Information about Dwarf Planets Discovered
Only two of these bodies, Ceres and Pluto, have been observed in enough detail to demonstrate that they actually fit the IAU's definition. The IAU accepted Eris as a dwarf planet because it is more massive than Pluto. They subsequently decided that unnamed trans-Neptunian objects with an absolute magnitude brighter than +1 (and hence a diameter of ≥838 km assuming a geometric albedo of ≤1) are to be named under the assumption that they are dwarf planets. At the time (and still as of 2019), the only additional bodies to meet this secondary criterion were Haumea and Makemake. However, doubts have since been raised about Haumea.
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