[vsnet-chat 4916] Re: Telephoto + CCD survey cameras

[Stupendous Man <richmond@a188-l009.rit.edu>]

  I read Takao-san's message with interest.  For those who want
to try to calculate the theoretical limiting magnitude as a
function of solar distance below the horizon, it might be useful
to read this short document:

      http://a188-l009.rit.edu/tass/technotes/tn0021.html

  It describes measurements of the sky brightness in I-band
with a TASS Mark III system: a 135-mm telephoto lens with
CCD + I filter.  The effective exposure time was about 471 
seconds, and the plate scale 13.8 arcseconds per pixel
(for more details on the instrument, read the paper in
PASP, 112, p. 397 (March 2000).   There are also more
details about the sky brightness in I-band and V-band,
as measured by this camera at a dark site in Vermont,
at 
      http://a188-l009.rit.edu/tass/technotes/tn0019.html

  I thought that the figure showing sky brightness 
(in instrumental units, alas: counts per pixel) together
with solar elevation might be useful for some purposes.

                                       Michael Richmond

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