NGC/IC Project Restoration Effort
(This is a very very beta version)
NGC4530
Basic Information
Location and Magnitude
Right Ascension: 12:33:47.6
Declination: +41:21:14
Constellation: CVN
Visual Magnitude: 4.3
Historic Information
Discoverer: Herschel J.
Year of discovery: 1828
Discovery aperture: 18.3
Observational
Summary description: Nebulous * 4 mag??? (8 Canum)
Sub-type: *
Corwin's Notes
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NGC 4530 = 8 Canum Venaticorum (Beta CVn) is a star, though JH recorded a
"nebulous atmosphere" around it on four different nights. Dreyer notes in
the NGC that of the late 19th century observers, only Tempel suspected the
nebulosity, and even he was unsure about its existence.
There is no trace of nebulosity on modern photographs, and the star's spectrum
shows it to be a normal G0 V main sequence star with no strong emission lines.
Thus, it was probably just JH's bad luck to have seen the star on four poor
nights. Or his imagination may have been triggered three times by one poor
night. In any event, there is only a star here.