Sky Brigntness in I

["Thomas F. Droege" <droege@fastmail.fm>]

I was just looking at the .list files from a few minutes ago.  I was
concerned that the tom3 v camera reconstructed every image whie the i
image had no successes.  This for 19 v and 19 i images.  On inspection,
all the i images had excess sky brightness while the v images were
normal.

Looking further:

tom1 looking near horizon v and i background about 5000 ADU.
tom2 looking straight up v of order 10000 counts, i of order 15,000
counts.
tom3 looking toward pole v of order 5000 counts, i of order 15,000
counts.

There is a full moon, but it should nearly be set for this data. Does
anyone know about the brightness of the i sky?  I would have expected
the camera looking straight up to have low sky brightness.

Tom Droege
-- 
  Thomas F. Droege
  droege@fastmail.fm