Interesting picture. Some important points:
1) The length of the trail is 5 arc minutes, not 18.
2) The object does *not* seem to brighten or darken. It only looks this way
as it
passes across parts of the ccd that were lightened due to the nebula.
You can even
see that lines in the nebula brighten as they pass through the trail.
Although at the lower end
it does seem quite bright and I can't find a star here on picture below,
but maybe it is a variable
star.
3) Regarding FOV, top to bottom (narrow way) is about 45 arc minutes or 3/4
of a degree.
4) In this picture, North is to the left. This picture is maybe 4 degrees
misaligned so
the trail is neither east-west nor north-south.
5) This is a fantastic picture of the Veil nebula! For an even better
picture with a similar magnification, see:
http://antwrp.gsfc.nasa.gov/apod/image/0008/witchsbroom_gendler_big.jpg
- George Roberts (take out the "_nospam" to email back to me)
mailto: gr_nospam@pobox.com
http://www.pobox.com/~gr
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