Sharpless 140 in Cepheus
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Scope: C8 203mm  at f/4.8,  Location: Dos Picos Park, Ramona, CA  19 October,  2007,   Camera: Artemis285

Exposure: 8 x 10 min H-Alpha (1x1), 8 x 1.5 min RGB Exposures (2x2). 

Processing: Images were captured  with Artemis Capture (as FITs).  Aligned/stacked and dark subtracted in Astroart with Sigma Combine.   H-Alpha  and Color channels were scaled and  color balanced in Astroart.  Central gradient removal was performed in Astroart. Channels were co-registered in Astroart.  Luminance construction consisted of the H-Alpha exposure.  Curves and Levels applied in Photoshop to the Luminance construction to optimize object features.  Final LRGB combine was done in Photoshop using Luminance Layering (or LLRGB). A color adjustment made to correct the color at low RGB signal levels.  A light background noise reduction was applied in PixInsight LE (SBNR)  Selective sharpening was applied to nebula features in Photoshop with a layer mask.  Final Image size is approximately 1040x1392

 North is up in this image. The field in this image is from the constellation of Cepheus. Sharpless 140 is a faint emission nebula in this image. The  bright blue stars near the center of the image likely provide the UV energy to create the emission in the nearby hydrogen.   The Horizontal FOV is 32'.

Image center is located approximately - Equatorial 2000: RA: 22h 18m 25s Dec: +6313'12"

 

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