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I simply have a notebook that I keep. I note the date, time and weather conditions and how good/bad the transparency and seeing are.
I then note the objects catalogue number (NGC/IC or M number usually and a brief description, for example "GX (galaxy) in Virgo".
I then give a quick synopsis of how I found object by starhopping. This enable me to verify later that I have found the correct object. I then make some notes on its visual appearance and how it varies at different powers. If using different eyepieces or filters I note those also.
I have an excel database of all the NGC/IC objects that I have observed that I update regularly. It contains the dates of my observations so I can find my notes if I need to. I keep a copy of the printout in my observing kits so I can refer to it when at the telescope.
Anyways that's what I do. Others like to use computerised systems, but I find notebooks easier to use at the scope. To date I have notes on about 550 objects.
Malcolm
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