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Not too bad but, imho, you need much more data, I would be aiming for something like 100 subs for each filter. There is much more detail there to be had. I always use 5min NB subs, on faint objects, but it does depend on your mount and guiding setup.
The ASI1600 will be fine at temps below -10C, so don't stress too much about that. Pick a temp it can hold. Imaging on warm night's is always a challenge. Just make sure you shoot darks and bias at the same temperature.
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