Sednoids
A sednoid is a trans-Neptunian object with a large semi-major axis and a high perihelion, similar to the orbit of the dwarf planet Sedna (dwarf planet), Sedna. The consensus among astronomers is that there are only four objects that are known from this population: Sedna, , 541132 Leleākūhonua (), and . All four have perihelia greater than . These objects lie outside an apparently nearly empty gap in the Solar System and have no significant interaction with the planets. They are usually grouped with the detached objects. Some astronomers consider the sednoids to be Inner Oort Cloud (IOC) objects, though the Hills cloud, inner Oort cloud, or Hills cloud, was originally predicted to lie beyond 2,000 AU, beyond the aphelia of the known sednoids. One attempt at a precise definition of sednoids is any body with a Perihelion and aphelion, perihelion greater than and a semi-major axis greater than . However, this definition applies to the objects , , and which have perihelia be ...
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