Looking back over the images taken it appears that the cooler failed on January 17th 2010 – so nowhere near as long ago as I thought, and it wasn’t at the time the PSU went down. The number of hot pixels dramatically increased in the images, and the noise may have gone up a tad, but apart from the hot pixels there wasn’t too much to show for it (apart from the extra unnecessary processing Noel would have had to have carried out 🙂 Interesting! Down to the high speed of the Hyperstar and the short sub-exposure times. If I worked at higher f-numbers the Peltier failure would have been more quickly recognised that’s for sure.
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