The Iris Nebula

The Iris Nebula (NGC 7023, Caldwell 4) is a beautiful reflection nebula resembling an iris flower in the constellation Cepheus. NGC 7023 is actually a cluster within the nebula nebula that is lit by a bright star SAO 19158). It lies 1,300 light-years away and is six light-years across (source: wikipedia).

I have been wanting to image the Iris nebula for quite a while now and the CSP27 event I attended on September 23rd was the perfect opportunity.  All nebulae are better to shoot at a dark site, however, some nebulae are more forgiving especially if filters are used. The Iris is not so forgiving so it is better done at a dark site rather than my yard (it is not visible from my shed). 

This was the second object I imaged during the evening, the first was M30.  As it turns out I should have spent the rest of the night on this object as I had it centered and focused perfectly.  However, I decided to go to the Heart nebula but had some problems of my own doing that I will discuss when I post it.  I did learn about the importance of taking the time to ensure proper focusing!  With that said I was very happy to get three hours on the Iris and I am satisfied with how it turned out. It has an interesting blueish tint with dark areas surrounding it and to the right side of the image.  The dark areas are actually dust that blocks the light from the stars behind it.

Crop

Wide Field

NGC 7023 - Iris Nebula
Location: CSP27, Goshen, CT
Date: 9-23-2017
Camera: Canon EOS Rebel T3i(a), Backyard EOS
Telescope: Orion ED80 80mm f/7.5 Apochromatic Refractor Telescope
Barlow: None
Focal Length: 600mm
f/7.5
Focal Reducer: Orion 0.8x Focal Reducer for Refractor Telescopes
Mount: Orion Atlas Pro EQ/AZ Mount
Filter: Astrodon UV/IR
Autoguiding: QHY-5L-II-M attached to an Agena 50mm Guide Scope with Helical Focuser
Exposure: 49 x 210s
ISO: 1600
Temp: 20 C
Post Processing: Deep Sky Stacker, Photoshop, Lightroom, Gradient Exterminator, Astronomy Tools, StarTools.
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