For highly elliptical objects like Halley's Comet, what two AU measurements are most useful to provide?
Answer
Perihelion (closest point) and aphelion (farthest point) distances.
Because of extreme elongation, stating a single average distance for comets is less useful than providing both the perihelion and aphelion distances, both expressed in AU.
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AU and Light Years Explained - How we measure space - YouTube
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