in the context of TNOs. There is no ambiguity, since by definition TNOs have periods longer than Neptune's. The order used depends on the author and research field.

Origin

Detailed analytical and numerical studies of Neptune's resonances have shown that the objects must have a relatively precise range of energies. If the object's semi-major axis is outside these narrow ranges, the orbit becomes chaotic, with widely changing orbital elements. As TNOs were discovered, more than 10% were

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