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Date: Mon, 26 Jul 93 13:29:10 CDT From: wgd@houston.geoquest.slb.com (Bill Dillon) Subject: CCD charts Dear Taichi, Thank you very much for the x-y-mag. information! Some questions on your charts. What are the approximate dimensions of your CCD frames? Is there any relative rotation between the two frames? Do the two frames have the same scale? What are the approximate errors in position and magnitude? Is north at the top and east on the left? The zenith magnitude limit at my home on a good night with my 28 cm SCT is about 13.8. Once a month I work at the George Observatory, where the skies are darker and, when it is working properly, I have access to a 91 cm reflector. I will try to plot your chart up use it on my next visit to the observatory. Thanks again, and clear skies, Bill (W. G. Dillon, Missouri City, Texas, USA)
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