[AZ-Observing] Re: Double stars for seeing test

Brian, et al;

Just wondering on this subject.  If I counted the number of stars in a
globular cluster that were resolved at the same magnification from night to
night, would that also be a good test of seeing?  Any of the big Messier's
might be too much to do consistently, but how about M 71 or M 56, where the
Nexstar 11 would resolve 5 stars or so in poor seeing and 10 to 20 on better
nights.  Would variable stars in the clusters make that method invalid?

Steve Coe

Author "Deep Sky Observing--The Astronomical Tourist"
Saguaro Astronomy Club website
www.saguaroastro.org

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