Sh2-157 Region in Cepheus and Cassiopeia



Scope: Megrez II  at f/4,  Location: Blair Valley, Anza Borrego Desert, CA   23 September 2006,   Camera: Artemis285

Exposure: 5 x 480 sec H-Alpha (1x1),  5 x 120 sec IR/UV Block Filter (1x1), 6 x 90 sec RGB Exposures (2x2). 

Processing: Images were captured  with Artemis Capture (as FITs).  Aligned/stacked in Registax 3 and saved as FITS. Luminance,  H-Alpha, IR/UV Block,  and Color channels were scaled and  color balanced in Astroart. Channels were co-registered in Astroart.  Curves and Levels applied in Photoshop to optimize object features. Luminance construction consisted of the H-Alpha exposure mixed with the IR/UV Block exposure. Final LRGB combine was done in Photoshop using Luminance Layering (or LLRGB) - G2V calibration factors and Atmospheric Extinction factors were applied. H-Alpha data was mixed with red for color channels. I also applied hue restoration to correct any red shift introduced in the LRGB. Sharpening was applied to nebula features in Photoshop with a layer mask.  Final Image size is approximately 1040x1392.

All exposures in this image were guided; North is up in this image. This region is dominated by an emission cloud in this region. The region is in  Sharpless' catalog (Sh2-157). The small cluster of stars forming a diagonal line on the upper right  is NGC 7510. The bright orange "star" in the lower right is really a planetary nebula - PLN 110-0.1.  This region is on the  boarder between constellations of Cepheus and Cassiopeia just south east of M52 and the Bubble Nebula.  The Vertical FOV is 96'.

Image center is located approximately - Equatorial 2000: RA: 23h 15m 02s Dec: +6006'21"


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