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How bright are bright nebula?
We don't have magnitudes for bright nebula.
The best brightness values that I have seen are in the:
Visual Catalogue of Galactic Nebulae
by Andreas Alzner and Ronald Stoyan (alz & rcs in the files)
in the Webb Society Quarterly Journal, January 1996
They rank them as:
1=very bright (M 42, M 17)
2=bright, easy without filter (M 78, NGC 1491)
3=of medium brightness, mostly good use of filtration (NGC 2174, NGC 896)
4=faint (S 157, S 301)
5=very faint, definite (VMT 10, IC 2118)
6=very faint, only suspected (S 188, S 240)
e= details visible
The attached 2 files list some nebula in order from bright to faint.
The first file is from telescopes 120 to 200 mm in aperture, R = refractor, N = newtonian.
The second file is from 360 mm newtonians.
The files can be copied into MS Excel.
Last edited by glenc; 28-08-2006 at 11:41 AM.
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