NGC/IC Project Restoration Effort

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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

===== 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.