Sh2-157 Region in Cepheus and Cassiopeia
CLICK ON IMAGE FOR FULL SIZE VIEW (2800x2099)
Scope: MN152 Mak-Newt at f/4.8, Location: Tierra Del Sol (SDAA site), CA 10 September 2010, Camera: SBIG ST8300M
Exposure: 12 x 9 min H-Alpha (1x1), 8 x 3 min RGB Exposures (2x2).
Processing: Images were captured with CCDSoft. Aligned/stacked and dark subtracted in Astroart ; Sigma Combine method was used for stacking subs. Central gradient was removed in Astroart. All channels were scaled and equalized in Astroart. Channels were co-registered in Astroart. G2V factors were applied to color channels in Astroart. The 9 minute H-Alpha exposures were used for the main luminance construction with level adjustments and curves to bring out object features. Some Levels and Curves were selectively applied excluding the brighter nebula areas. LRGB combine was done in Photoshop; 80% Ha data was blended into the red channel. Color balancing was applied to nebular regions with a star mask. Sharpening was done on the luminance channel. Final touches and color balance tweaks in Photoshop. Final Image size is approximately 3352x2532 (resized to 2800x2099).
All exposures in this image were guided; North is to the right in this image. This region is dominated by an emission complex. The region is in Sharpless' catalog (Sh2-157). The small cluster of stars forming a diagonal line on the lower right is NGC 7510. In the lower left is a planetary nebula - PLN 110-0.1 below the main body of the emission nebula. This region is on the boarder between constellations of Cepheus and Cassiopeia just south east of M52 and the Bubble Nebula. This image replaces an earlier image in the Archives here. The Vertical FOV is 88'.
Image center is located approximately - Equatorial 2000: RA: 23h 15m 02s Dec: +60°06'21"
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