Classification Eris (dwarf planet)
distribution of trans-neptunian objects
eris trans-neptunian dwarf planet (plutoid). orbital characteristics more categorize scattered-disk object (sdo), or tno has been scattered kuiper belt more-distant , unusual orbits following gravitational interactions neptune solar system forming. although high orbital inclination unusual among known sdos, theoretical models suggest objects near inner edge of kuiper belt scattered orbits higher inclinations objects outer belt. inner-belt objects expected more massive outer-belt objects, , astronomers expect discover more large objects eris in high-inclination orbits, have traditionally been neglected.
because eris thought larger pluto, described tenth planet nasa , in media reports of discovery. in response uncertainty on status, , because of ongoing debate on whether pluto should classified planet, iau delegated group of astronomers develop sufficiently precise definition of term planet decide issue. announced iau s definition of planet in solar system, adopted on august 24, 2006. @ time, both eris , pluto classified dwarf planets, category distinct new definition of planet. brown has since stated approval of classification. iau subsequently added eris minor planet catalogue, designating (136199) eris.
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