NGC/IC Project Restoration Effort
(This is a very very beta version)
NGC6428
Basic Information
Location and Magnitude
Right Ascension: 17:43:52.4
Declination: +25:33:18
Constellation: HER
Visual Magnitude:
Historic Information
Discoverer: Bigourdan
Year of discovery: 1885
Discovery aperture: 12.4
Observational
Summary description: vF, S, stellar
Sub-type: *2
Corwin's Notes
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NGC 6428 is a star. Bigourdan's position is midway between it and another
star of similar magnitude, but his description mentions both objects and makes
clear that he was measuring the northern of the pair: "In the neighborhood,
I suspect several small stars, one of which is at PA = 195 deg, d = 8-10
arcsec [from his nebulous star]."
I've added the phrase in square brackets above following a question from
Jeffrey Corder who asked about the sense of the offset: "With a PA of 195
deg, wouldn't the correct star be the southern one?"
Whenever Bigourdan makes comments about neighboring objects, he always uses
the main, usually measured, object as origin. In this case, the northern star
is that origin, and the southern is the one in the notes. This may be even
clearer with Bigourdan's full description at hand. Here is my rough and ready
translation:
7 Jul 1885: Small stellar nebula, of indiscernable form, which could be a
small cluster. In the field, I suspect several small stars, of which one is
toward PA = 195 deg, d = 8-10 arcsec.
He has a second observation from January of 1892, but makes no mention of
neighboring objects.