which produces an anti-tail. There is a considerable piling up of older synchrones producing the observed sharp edge on to the anti-tail. Younger synchrones are also crowded together while those of intermediate ages are spread out over a broad area of sky making the tail fainter in this region and giving the impression that the it is split into a main branch and a sunward branch.

Neck-line structure

Dust particles ejected isotropically from the comets nucleus follow their own Keplerian orbit,

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