Last night, with poor seeing, I was attempting to image my 1st Planetary Nebulas, and by 9pm it was -3. By 10pm everything had ice on it. Then about midnight the temp rose up to Zero and the ice started to melt.
Then about 2am I noticed everything had frozen again. I had to give up at 2:30am because the fog took over and visibility was only about 10m.
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