NGC/IC Project Restoration Effort
(This is a very very beta version)
NGC6413
Basic Information
Location and Magnitude
Right Ascension: 17:40:40.7
Declination: +12:37:26
Constellation: OPH
Visual Magnitude:
Historic Information
Discoverer: Stephan
Year of discovery: 1870
Discovery aperture: 31.0
Observational
Summary description: vF, vS, smbM
Sub-type: *4
Corwin's Notes
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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.