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Good stuff Paddy. Grus is a nice playground indeed. Your obs of NGC 7424 has caught my eye, an object I have also observed. You obviously fared better with your 16" than myself with my 8" from suburban skies!
My obs from August 23, 2014 with the 8" under good transparency:
NGC 7424
GX, Grus, Mag V= 10.5, SB= 14.9
This is a large face on spiral and as such, a painfully low surface brightness object. A small, faint, diffuse and weakly condensed core was seen at 92x. No hints of any surrounding haze. A mag 12 and mag 13.5 star pair resides approx 3.5' north of the core.
A similar face-on spiral galaxy, NGC 5332, is not far away in Sculptor. On the same night, this appeared fainter than 7424, basically just a very faint haze according to my notes.
cheers and looking forward to more reports!
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