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The orbits of a large number of Kuiper Belt objects are harmonious with Neptune's orbit. The strongest resonance that appears is the 3:2 resonance; a Kuiper Belt object in this orbit completes two revolutions of the Sun in the time it takes Neptune to complete three.
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www.astrophysicsspectator.com/topics/planets/KuiperBelt...
www.astrophysicsspectator.com/topics/planets/KuiperBelt.html
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Level 3 Science ... AS 90733 version 2 ... 1. The theme is Kuiper Belt Objects and Why Pluto Was Demoted.
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www.onslownet.school.nz/library/science/Kuiper%20Belt%2...
www.onslownet.school.nz/library/science/Kuiper%20Belt%20Objects.htm
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Many orbit in 3:2 resonance with Neptune (as does Pluto). Color measurements of some of the brightest have shown that they are unusually red. In late 2002, a Kuiper Belt object over 1000 km in diameter was discovered and provisionally designated 2002 LM60 "Quaoar". ... More about Kuiper Belt objects...
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www.nineplanets.org/kboc.html
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Designation (and name) Discovery date, site and discoverer(s) 2009 KO30 41.401 47.464 8.8 20090708 218.0 342.0 53.9 9.4 0.068 44.432 ( 89d) MPO160910 2009 KO30 2009 05 25 568 M. Yagi 2009 KM30 41.448 41.991 9.0 20090618 0.1 224.7 24.4 3.8 0.006 41.720 ( 53d) MPO160910 2009 KM30 2009 05 25 568 M. Yagi 2009 KL30 36.780 54...
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www.cfa.harvard.edu/iau/lists/TNOs.html
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Unusual high-e objects are shown as cyan triangles, Centaur objects as orange triangles, Plutoids (or Plutinos, objects in 2:3 resonance with Neptune) as white circles (Pluto itself is the large white symbol), scattered-disk objects as magenta circles and "classical" or "main-belt" objects as red circles.
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www.cfa.harvard.edu/iau/lists/OuterPlot.html
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The apparent magnitude is V = 24.2. For more information see David Jewitt's Kuiper Belt Home Page. Since then nearly 100 objects like QB1 have been found. They are thought to be similar to Pluto in composition and, like Pluto, many orbit the sun in a 3:2 resonance with Neptune.
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science.nasa.gov/newhome/headlines/ast17feb99_1.htm
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The first of these strange bodies, which astronomers call Kuiper Belt Objects (KBOs), came to light in 1992, discovered by Dave Jewitt ... Beginning in 1987 they had doggedly scanned the heavens in search of dim objects beyond Neptune. It took five years, looking off-and-on through the University of Hawaii's 2.2 m telescope,
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science.nasa.gov/headlines/y2001/ast13sep_1.htm
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how many planets? ... In the asteroid belt Ceres, with a diameter of 900 km, is the only object large enough to be round, so somewhere around 900 km is a good cutoff for rocky bodies like asteroids. Kuiper belt objects have a lot of ice in their interiors, though. ... Jewitt et al.: 3 planets...
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www.gps.caltech.edu/~mbrown/whatsaplanet/howmanplanets....
www.gps.caltech.edu/~mbrown/whatsaplanet/howmanplanets.html
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