Some older sources prefer to assign the catalogue number NGC 6820 to the entire surrounding nebula, a wide region extending across some forty arcminutes of sky. This broader nebula is now more usually known by its Sharpless number, Sh 2-86, and the identity NGC 6820 refers (as here) to the small bright nebula within it.
NGC 6820 is a small light patch in the much broader mass of nebulous material designated Sh 2-86 in Vulpecula. This area is illuminated by the light of the young clusterCollinder 404, a collection of stars that have recently formed within this region of stellar formation. Imagery provided by Aladin sky atlas
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