Harold Corwin

NGC 6413 is a group of four or five stars at Stephan's position. As far as I know, it was first identified as an asterism by Brian Skiff. It seems a bit unusual to me that it should go unidentified until Brian looked at it, and we might want to do a search of the literature.

Stephan apparently used alpha Oph as his comparison star. That has a very large proper motion, and may have been difficult to set up on due to its brightness (V = 2.1), so Stephan's position re-reduced from Esmiol's monograph is probably more uncertain than is normal for his observations.

In any case, the identity is sure.

― NGC Notes by Harold Corwin

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