Very nice image!
One small thing though, the exposure time you quote is somewhat misleading as it is an equivalent value when stacking images, so your 27 x 4 minute exposures are equivalent to a 108 minute single exposure. There's a big difference as short exposures are far easier to make than long exposures as the longer the exposure the more prone the shot is to a variety of disasters in the making eg: wind gusts, bumping the scope etc.
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