Lowest Night Min: Benson (Berkshire): -17.7C about 20 miles away. (from BBC weather)
This image was taken using an IR and Blue filter, combined to produce a synthetic Green. (3000 frames per channel, using the best 1000 processed in Registax).
It was the best from the night, I didn't want to stay out too long as I was worried that the PC might get frosty and blow up! Plus it clouded over just as this finished and I certainly wasn't going to hang around in sub zero temperatures :-\
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That's Syrtis Major Planitia to the left just coming round the corner; see this