Classical Kuiper belt object

A classical Kuiper belt object, also called a cubewano (/ˌkjuːbiːˈwʌnoʊ/ "QB1-o"),^[a] 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: 15760 Albion, which until January 2018 had only the provisional designation (15760) 1992 QB1.^[2] 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:

• 15760 Albion^[3] (aka 1992 QB1 and gave rise to term 'Cubewano')
• 136472 Makemake, the largest known cubewano^{[citation needed]} and a dwarf planet^[3]
• 50000 Quaoar and 20000 Varuna, each considered the largest TNO at the time of discovery^[3]
• 19521 Chaos, 58534 Logos, 53311 Deucalion, 66652 Borasisi, 88611 Teharonhiawako
• (33001) 1997 CU29, (55636) 2002 TX300, (55565) 2002 AW197, (55637) 2002 UX25
• 486958 Arrokoth

136108 Haumea was provisionally listed as a cubewano by the Minor Planet Center in 2006,^[4] but was later found to be in a resonant orbit.^[3]

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