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Thanks for the very interesting link, Paddy.
Your link points to a fantastic resource about southern emission nebulae. I know nothing about the accuracy of the information, or about the people involved in this website, but apparently someone obsesses about southern emission nebulae all day and all night! This site is a totally massive data compilation about nebulae.
I can really relate to this obsession..... as I collect and collate galaxies data, for many hours every day!
cheers, madbadgalaxyman
The H-alpha brightness from the Georgelin H-alpha survey that I used for the selection of the most prominent objects in Norma and Ara should be a reasonable indicator of their visual brightness. While the Halpha line is out of range for the eye, objects that are bright in Ha are generally also bright in the [OIII] line that the eye strongly responds to.
[[ On a related issue, plenty of Blue Magnitude 12.5 - 13.5 galaxies were missed in the NGC/IC ; some of them had to wait till the ESO Survey at the end of the 1970s to be discovered ]]
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