Densities of objects in and from the Kuiper belt. In most cases, the uncertainty in diameter is much larger than the uncertainty in mass, so the density-diameter uncertainty lies along a curved path. Quaoar has a larger mass uncertainty than most other objects, and that full uncertainty is show as a vertical error bar at the position of Quaoar. Two possible density-radius solutions are show for Orcus, one where Orcus and its satellite Vanth have equal albedos (the less dense solution) and one where Vanth has a lower albedo more typical of smaller KBOs (the more dense solution).
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