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NC Astronomers Meets
At the Madelyn Helling Library
Community Room
980 Helling Way
Nevada City, CA 95959

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  Oct 7th
  1st Wednesday
  7pm - 9pm

SIT - an Update
by Lonnie Robinson &
Bill Thomas

When Amateur Telescope Makers - ATM'ers began using the inexpensive Bath Interferometer it was hoped at last amateurs had a test every bit as good as that used by the professionals. But then the Bath results were less than stellar for larger fast mirrors. Out of frustration, Bill Thomas devised the SIT which is now being used by Lonnie Robinson of Sacramento and Jeff Baldwin of Stockton.

Jeff Baldwin, is now using the SIT to figuring a very large fast mirror (32" f/2.8 mirror), and the question is will the SIT work? What are the SIT limitations? Well for starters, it's known for such a large fast mirror, the precision of the mask and its positioning on the mirror are critical. To address that, Lonnie Robinson will talk about the equipment and methods he has devised which will greatly improve the precision of SIT masks.

The only other test Jeff has for his project, is a Star Test, once the scope and mirror are finished, which underscores the need for a 2nd confirming test. The University of Arizona Pentaprism is one such promising test.

  Nov 4th
  1st Wednesday
  7pm - 9pm

Comet P/96 (Machholz)
by Don Machholz

Don Machholz is the most successful living visual comet hunter in the world. Credited with the discovery of 11 comets. Don will talk about Comet P/96 which has a most unusual chemical composition. One explanation, it's a comet from outside the Solar System.

Dec 2nd 1st Wednesday  7pm - 9pm  To be announced

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