Now located about
5 degrees straight up from Polaris in the northern sky, this
comet is still just barely naked eye from our dark Happy Jack
site, making it around magnitude 6.5 or so. This image with a
good 2 degree field around the comet shows a blue ion tail to
the right, and a broad diffuse fan pointing generally upward.
The comets emerald green coma is still very intense in coloration,
with a small stellar nucleus in the middle easily seen as well.
The stars as you may notice are trailed. That is because the
image is guided on the comets moving nucleus to get a sharp image
of the comet, while the background stars trail a bit.
The 10D and most DSLR's
have the perfect spectral response for shooting comets. They
peak in the green and at ISO 800 to 1600 allow some very detailed
images of these celestial visitors.