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They often describe scattered disc objects as "scattered Kuiper belt objects". [108] Eris, which is known to be more massive than Pluto, is often referred to as a KBO, but is technically an SDO. [107] A consensus among astronomers as to the precise definition of the Kuiper belt has yet to be reached, and this issue remains unresolved.
Other objects, such as 28978 Ixion (discovered in 2001) and 20000 Varuna (discovered in 2000) measure roughly 500 km across. [1] This has led gradually to the acceptance of Pluto as the largest member of the Kuiper belt. [citation needed] The brightest known dwarf planets and other KBOs (with absolute magnitudes < 4.0) are:
A classical Kuiper belt object, also called a cubewano (/ ˌ k juː b iː ˈ w ʌ n oʊ / "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 ...
All asteroids should be sorted using a 0-padded 6-digit sortkey based on their numerical designation.Otherwise, their provisional designation should be used. For example:
Kuiper belt large belt, 43 to 64.5 AU; Scattered disc small group, 21.5 to 215 AU; Sednoid (inner Oort cloud objects) small group of four or more, high elliptical orbits, 47.8 to 80 AU; Extreme trans-Neptunian objects 150 to 250 AU; Hills cloud a large hypothetical circumstellar disc
486958 Arrokoth (provisional designation 2014 MU 69; formerly nicknamed Ultima Thule [a]) is a trans-Neptunian object located in the Kuiper belt.Arrokoth became the farthest and most primitive object in the Solar System visited by a spacecraft when the NASA space probe New Horizons conducted a flyby on 1 January 2019.
It is the ninth-largest and tenth-most-massive known object to directly orbit the Sun. It is the largest known trans-Neptunian object by volume, by a small margin, but is less massive than Eris. Like other Kuiper belt objects, Pluto is made primarily of ice and rock and is much smaller than the inner planets.
It flew past the Kuiper belt object 486958 Arrokoth on January 1, 2019, as part of the Kuiper Belt Extended Mission (KEM). [10] On April 17, 2021, it reached a distance of 50 AU from the Sun. [11] Although other probes were launched first, Voyager 1 has achieved a higher speed and overtaken all others.