[AZ-Observing] Re: Thanksgiving Sky

>>  NGC1990 Very faint and extensive nebula centered on Epsilon Ori....

     The prevailing opinion is that this nebula does not exist.
You do, however, join a distinguished list of folks who have
seen it:  both Herschels, Struve, Dreyer, Steve Coe, and many others.
See the summary, for instance, given by Harold Corwin, close to the
bottom of:

http://www.ngcic.org/corwin/DataFiles/Aug_2006/ngcnotes_1.txt

Perhaps the "silicon owl" could take up Harold's imaging challenge:
to produce an image having high contrast, little scattered light,
and a surafce brightness threshold faint enough to either show the
nebula or not at a level detectable by eye.

\Brian
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