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Re: [ATM] Metallic Mirrors Vol 9, Issue 20
Andy Saulietis wrote:
> We had a 3m rotating mercury telescope here in Cloudcroft for a
> few years..it was a NASA project to get info on orbital debris.
> The Hg layer was onliu a mm or so thick, the epoxy dish was
> spin cast to be approximately parabolic shape. The obsevers
> were in an environmentally isolated room both to protect
> them and not add to air motion on the mirror. A large CCD
> with a coma corrector was exposed/read out continuously in synch with
> the earth rate to reacs ~23rd mag in a few minutes effective exposure.
Wonder if mercury vapor hypers the CCD?;-)
--
Rick S.
http://users.rcn.com/rflrs
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