member of the extended disk is . Sednoids have perihelia very far removed from the orbit of Neptune. This group is named after the best-known member, 90377 Sedna. As of 2020, only 3 objects in this category have been identified, but it is suspected that there are many more. The Oort cloud is a hypothetical cloud of comets with a mean orbital radius between approximately 50,000 AU and 100,000 AU. No Oort-cloud objects have been detected; the existence of this classification is only inferred from indirect evidence. Some astronomers have tentatively associated 90377 Sedna with the inner Oort cloud. See also Dwarf planet Minor Planet Center Mesoplanet References External links Asteroid Classification I – Dynamics, Minor Planet Center, (archived; 18 Apr 2011) Minor-planet groups