Sneak Preview Report @ APO on Monday Feb 11

Monday I spent the day cleaning the mirror for the 10″ Harry Brewster Brown Telescope that is in the dome. I also cleaned and fixed the 13″ mirror and mirror mount for the 13″ DOB. Monday night we had a sneak preview out at the Arthur Pursell Observatory (APO). Ronnie, Butch, Skip, and Kimber  and I attended. It was a great night. The weather was very pleasant. Butch & Skip worked on the DOB while Ronnie and I put the mirror back into the dome scope. Butch’s collimator was not working so we couldn’t easily get the scopes dialed in perfectly. Both scopes worked great. The stars focused nicely in both scopes. We looked at the Orin Nebula thruough the 10″ dome scope.

I found out that the mirror for the 10″ was make by Cave Optical in Long Beach California for the TAA. It was finished on October 3, 1966. It has a focal length of 77.75 inches = f/7.775. I always wondered who made the mirror and what the quality of it was. For those that don’t know, Cave Optical was the premier mirror maker for astronomical telescopes. His mirrors are still very desirable to this day. The scope still needs work but it is great to know that we have a mirror made by a great maker.

I am looking forward to March 30th when the TAA will have its first star party at the Arthur Pursell Observatory in 9 years. Hope to see you there. Stay connected for more deatailes.

Greg

10" mirror dirty

Dirty mirror. It is 46 years old. Who knows when it was last cleaned

Notice the cobwebs and the white spots where the coating has deteriorated.

Notice the cobwebs and the white spots where the coating has deteriorated.

 

 

 

 

 

 

 

 

 

The mirror is now clean.

The mirror is now clean.

 

 

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Greg Eckes

President

I am a retired music teacher. I make custom violins and violas. I play violin in the Tulare County Symphony and fiddle in the Tule River Bluegrass Band. I like camping and astronomy.

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