Those poor objects stuck in size between asteroids and true planets.
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A newly-discovered dwarf planet has redefined currently-known distance limits for this category. 2012 VP113 (I didn't have the ability to use subscript in the heading) has a calculated perihelion of 80AU, whereas Sedna's is 76AU. 2012 VP113 is about 485 kilometers wide and probably spherical, though five times smaller than Pluto. This story appears as one of the top 100 science stories of 2014 in the January/February 2015 Discover from Kalmbach Publishing. Bill Andrews wrote the brief article on page twenty-eight.