page_title: (528381) 2008 ST291
section_title: Orbit and classification
hierarchical_section_title: (528381) 2008 ST291 / Orbit and classification
caption_attribution_description: The orbit of 2008 ST291 compared to Pluto and Neptune. This dwarf planet candidate takes over 1,000 years to orbit the Sun. Of the dwarf planets and known dwarf planet candidates, only Sedna and 2005 QU182 are known to have a longer orbit around the Sun.
context_page_description: (528381) 2008 ST₂₉₁, provisional designation 2008 ST₂₉₁, is a 1:6 resonant trans-Neptunian object and dwarf planet candidate located in the outermost region of the Solar System that takes almost a thousand years to complete an orbit around the Sun. It was discovered on 24 September 2008 by American astronomers Megan Schwamb, Michael Brown and David Rabinowitz at the Palomar Observatory in California, with no known earlier precovery images.
context_section_description: 2008 ST₂₉₁ is located at the 1:6 Neptune resonance of 99 AU meaning that it completes roughly 1 orbit for every 6 orbits Neptune makes. It orbits the Sun at a distance of 42.3–157.5 AU once every 998 years and 4 months (semi-major axis of 99.89 AU). Its orbit has an eccentricity of 0.58 and an inclination of 21° with respect to the ecliptic. Currently located at 60.9 AU from the Sun, the object came to perihelion in 1954.
caption: Orbit comparison of 2008 ST291, Pluto and Neptune
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