What estimated minimum value must the dominance parameter (C) reach for an object to generally be considered to have cleared its neighborhood?

Answer

Greater than 100.

If the calculated dominance parameter, C, results in a value greater than 100, the object is generally considered to have cleared its neighborhood and meets the third criterion for planethood.

What estimated minimum value must the dominance parameter (C) reach for an object to generally be considered to have cleared its neighborhood?

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Clearing the neighbourhood - YouTube

DefinitionastronomyorbitplanetIAUclearing the neighborhood