Topic summary
Trans-Neptunian
Extracted from the Wikipedia article Trans-Neptunian object.
Extreme trans-Neptunian objects
Among the extreme trans-Neptunian objects are high-perihelion objects classified as sednoids, four of which have been confirmed: 90377 Sedna, 2012 VP113, 541132 Leleākūhonua, and 2023 KQ14. They are distant detached objects with perihelia greater than 70 AU. Their high perihelia keep them at a sufficient distance to avoid significant gravitational perturbations from Neptune. Previous explanations for the high perihelion of Sedna include a close encounter with an unknown planet on a distant orbit and a distant encounter with a random star or a member of the Sun's birth cluster that passed near the Solar System.