plutinos
Pluto
['high harz', 'ashurbanipal', 'legendary greek hero', 'moscow', 'warrington', 'platonic dialogues', 'osaka', 'allegheny river', 'mariehamn', 'claude shannon', 'apple macintosh', 'christian iv', 'senegal', 'george frideric handel', 'corfu', 'petropavl', 'leghorn', 'unasur', 'adolf dassler', 'creuse river', 'archduke franz ferdinand', 'teddy roosevelt', 'russian', 'pallas athena', 'sarnia', 'frunze', 'faenza', 'vincent van gogh', 'kingsford smith', 'daegu', 'river niger', 'stettin', 'savonlinna', 'sallanches', 'yosemite', 'kinmen county', 'internet systems consortium', 'lucio battisti', 'agartala', 'coney island', 'pork pie', 'arctic', 'tchaikovsky', 'errol flynn', 'geneva', 'pc', 'nakhon ratchasima', 'phillip ii', 'kiev', 'bilbao', 'the new york times company', 'kelowna', 'queen victoria', 'kista', 'tanganyika', 'the queen', 'lagos state', 'mozambique', 'ethnikos achna fc', 'arafura', 'kandinsky', 'edgware', 'niobe', 'hasso plattner', 'longfellow', 'benny andersson', 'meta river', 'brandenburg', 'bletchley', 'delaware', 'rio grande', 'shiva', 'sicyon', 'alexander', 'coldstream', 'mashhad', 'mwanza', 'duchesne', 'leo baekeland', 'michael faraday', 'brouwer', 'merehead quarry', 'archimedes', 'antsiranana', 'edvard grieg', 'artificial intelligence', 'helios', 'eindhoven', 'kennebec river', 'oporto', 'stephen i', 'tazio nuvolari', 'vigo', 'chancery', 'kavieng', 'christ', 'oslo', 'morristown', 'trabzon']
Clearing the neighbourhood
"Clearing the neighbourhood around its orbit" is a criterion for a celestial body to be considered a planet in the Solar System. This was one of the three criteria adopted by the International Astronomical Union (IAU) in its 2006 definition of planet. In 2015, a proposal was made to utilise the criterion in extending the definition to exoplanets. In the end stages of planet formation, a planet (as so defined) will have "cleared the neighbourhood" of its own orbital zone, meaning it has become gravitationally dominant, and there are no other bodies of comparable size other than its own satellites or those otherwise under its gravitational influence. A large body that meets the other criteria for a planet but has not cleared its neighbourhood is classified as a dwarf planet. This includes Pluto, which is constrained in its orbit by the gravity of Neptune and shares its orbital neighbourhood with Kuiper belt objects such as the plutinos. The IAU's definition does not attach specific numbers or equations to this term, but all the planets have cleared their neighbourhoods to a much greater extent (by orders of magnitude) than any dwarf planet, or any candidate for dwarf planet. The phrase may be derived from a paper presented to the general assembly of the IAU in 2000 by Alan Stern and Harold F. Levison. The authors used several similar phrases as they developed a theoretical basis for determining if an object orbiting a star is likely to "clear its neighboring region" of planetesimals, based on the object's mass and its orbital period. Steven Soter prefers to use the term "dynamical dominance" and Jean-Luc Margot notes that such language "seems less prone to misinterpretation". Clearly distinguishing "planets" from "dwarf planets" and other minor planets had become necessary because the IAU had adopted different rules for naming newly discovered major and minor planets, without establishing a basis for telling them apart. The naming process for Eris stalled after the announcement of its discovery in 2005, pending clarification of this first step.