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Originally Posted by Starkler
I have also seen mention that the colour of paint used on a telescope tube makes a difference. IIRC, a white OTA will radiate more and get colder than a black one.
I wonder if there have been any comprehensive studies done on materials used commonly in telescopes.
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I did find some links to information on this stuff in 2004 when I was researching it. I'd just built my temp monitoring stuff and I was wondering why the tube was getting so cold (I had a steel tube painted white, about the worst possible design).
A quick search on the keywords "emissiviry" and "supercooling" turned up this gem of an article from the Gemini telescope project, read section 3.2:
http://64.233.179.104/search?q=cache...n&ct=clnk&cd=3
regards, Bird