It is so difficult to list just one deep sky object.
For me the Humunculus with my 16" is right up there but also The Dumbell in Vulpecula. The Swan in Sagittarius. With my OIII The Veil in Cygnus and Herschel's Ray or The Pencil in Vela.
However the most memorable things for me have been much closer to the Earth, The 2001 Leonids Storm is the most stunning thing I have witnessed in the night sky, there were two peaks, the first at 2000 per hr and the second 20 minutes later at 4 per second. I recorded data for Rob McNaught for this event in a spreadsheet using a talking countdown timer set to 5 mins. At it's best the whole sky was covered with meteor trails, a most memorable sight.
However a look at Saturn through current IIS member Steve Brownes hand built 8" Newt made a very great impression on me, but obviously does not rank as a deep sky object.
Probably another good thread title would be "Your most memorable astro observation".
Regards
Trevor
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