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A classical Kuiper belt object, also called a cubewano ( "QB1-o"),〔Somewhat old-fashioned, but still used by the Minor Planet Center for their list of (Distant Minor Planets )〕 is a low-eccentricity Kuiper belt object (KBO) that orbits beyond Neptune and is not controlled by an orbital resonance with Neptune. Cubewanos have orbits with semi-major axes in the 40–50 AU range and, unlike Pluto, do not cross Neptune’s orbit. That is, they have low-eccentricity and sometimes low-inclination orbits like the classical planets. The name "cubewano" derives from the first trans-Neptunian object (TNO) found after Pluto and Charon, . Similar objects found later were often called "QB1-o's", or "cubewanos", after this object, though the term "classical" is much more frequently used in the scientific literature. Objects identified as cubewanos include: * 〔 * Makemake, the largest known cubewano and a dwarf planet〔 * (50000) Quaoar and (20000) Varuna, each considered the largest TNO at the time of discovery〔 * 19521 Chaos, 58534 Logos, 53311 Deucalion, 66652 Borasisi, 88611 Teharonhiawako * , , , Haumea was provisionally listed as a cubewano by the Minor Planet Center in 2006,〔 〕 but turned out to be resonant.〔 〕 == Orbits: 'hot' and 'cold' populations == Most cubewanos are found between the 2:3 orbital resonance with Neptune (populated by plutinos) and the 1:2 resonance. 50000 Quaoar, for example, has a near-circular orbit close to the ecliptic. Plutinos, on the other hand, have more eccentric orbits bringing some of them closer to the Sun than Neptune. The majority of objects (the so-called 'cold population'), have low inclinations and near-circular orbits. A smaller population (the 'hot population') is characterised by highly inclined, more eccentric orbits.〔 ((Preprint ))〕 The Deep Ecliptic Survey reports the distributions of the two populations; one with the inclination centered at 4.6° (named ''Core'') and another with inclinations extending beyond 30° (''Halo'').〔 ((Preprint ))〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Classical Kuiper belt object」の詳細全文を読む スポンサード リンク
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