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NGC 7023 in Cepheus



Scope: C8 at f/6,  Location: Dos Picos Park, Ramona, CA   25 August 2006,   Camera: Artemis285

Exposure: 9 x 300 sec  IR/UV Block Filter (1x1), 6 x 150 sec RGB Exposures (2x2). 

Processing: Images were captured  with Artemis Capture (as FITs).  Aligned/stacked in Registax 3 and saved as FITS. Luminance, IR/UV Block,  and Color channels were scaled and  color balanced in Astroart. Channels were co-registered in Astroart.  Very slight Central Gradient removal was done in Astroart. Curves and Levels applied in Photoshop to optimize object features.  Final LRGB combine was done in Photoshop using Luminance Layering (or LLRGB) - G2V calibration factors and Atmospheric Extinction factors were applied.  Selective sharpening was applied to nebula features in Photoshop with a layer mask. Astronomy Tools noise reduction was applied at 50% opacity.  Final Image size is approximately 1386x1016.

All exposures in this image were guided; North is up in this image. NGC7023 is sometimes known as the Iris Nebula. The region NGC7023 contains significant interstellar dust which obscures the stars beyond somewhat and cause a dim reddish hue to the background. Distance estimates vary but the approximate distance from Earth is about 1,400 light years. This image replaces and earlier image that can be seen in the Archives here . The Horizontal FOV is 25'.

Image center is located approximately - Equatorial 2000: RA: 21h 01m 36s Dec: +6810'10"



All images and content remain the property of Jim Thommes - copyright 2003 - 2012

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