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This sketch is white pastel pencil on black A5 sketch paper. The nebula itself is brushed on with a thin paintbrush covered with the pastel dust.
The original sketch was photographed and put into photoshop. The texture of the paper shows up in the image and looks like noise, I darkened the background ever so slightly, if you look closely enough you still see a hint of it, I then added a circle border and the text.
The image below that is the exact same pencil sketch put into
Makes for a bit of fun and produces a nice digital copy of my original sketch that resembles what I see at the eyepiece.
The digital version.