[AZ-Observing] Re: Thanksgiving Sky

Hi All-

I imaged this area last march with a borrowed 70mm Pronto (forgive the
blue halos).  With several of the equally bright belt stars of Orion in
the frame, epsilon is the only one to show any hint of striated nebulosity
near it.  The field is full of other IC objects easily identified in
Uranometria, which evidently removed NGC 1990 in the "new" version.  Check
out:

http://alice.as.arizona.edu/~ketelsen/epsOriave4cropped.jpg

which is a 24 minute equivalent exposure with Pronto and 20Da.

-Dean


>>>  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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