Page "Classical Kuiper belt object" Paragraph 27
from
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Introduced by the report from the Deep Ecliptic Survey by J. L. Elliott et al.
in 2005 uses formal criteria based on the mean orbital parameters.
Put informally, the definition includes the objects that have never crossed the orbit of Neptune.
According to this definition, an object qualifies as a classical KBO if:
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1.811 seconds.