NGC 7023 in Cepheus (Wide Field)
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Scope: ZenithStar 66 mm APO @ f/4.5 Location: Laguna Mountains, CA   18 July, 2009  Camera: Artemis285

Exposure:  11 x 7 min IR/UV Block,  8 x 3 min R, 4 x 3 min G, 2 x3 min B Exposures 

Processing: Images were captured  with Artemis Capture (as FITs).  Aligned/stacked and dark subtracted in Astroart with Sigma Combine.   IR / UV Blocking  filter  and Color channels were scaled and  color balanced in Astroart.  Channels were co-registered in Astroart.   Luminance construction consisted of the IR/UV blocking filter exposures.  Curves and Levels applied in Photoshop to the Luminance construction to optimize object features.  A light background noise reduction was applied to the luminance construction in Photoshop.   Final LRGB combine was done in Photoshop using Luminance Layering.  A light background noise reduction was again applied on the color image in PixInsight LE (SBNR). A light sharpening was applied to nebula regions.   Final Image size is approximately 1092 x 1044.

All exposures in this image were guided; North is up in this image.  NGC 7023 is commonly known as the Iris Nebula. In this image of a wider field of the Iris Nebula, regions of interstellar dust can be seen.. Distance estimates vary but the approximate distance from Earth is about 1,400 light years. A close up image of the Iris Nebula was taken in 2006. The image can be seen here.   The Horizontal FOV is 101'.

Image center is located approximately - Equatorial 2000: RA: 20h 58m 10s Dec: +6800'18"

 

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