Scope: FSQ-106N at f/5, Location: Laguna Mountains, CA   20 July 2014  Camera: Atik 383L

Exposure: Exposure: 18 x 8 min  (2x2 bin) exposure with Hydrogen Alpha filter, 8 x 4 min (2x2 bin) RGB exposures.

Processing: Data Collection -  Artemis Capture (as FITs).  Calibrated, stacked (Kappa Sigma Combine) - Deep Sky Stacker. LRGB channel registration, equalization, and central gradient removal - Astroart.  Curves, Levels, RGB combine - ImagesPlus. Luminance Layering, final stretch, and finishing  - Photoshop. This image is a  Ha- RGB combine with Luminance layering.  Color saturation in LAB color; H-Alpha exposure stacks were used for the luminance layer.   Processing was in up-sampled  data (to simulate 1x1 bin). Final Image size is approximately 2800 x 2100.

North is up in this image. In this image the Sharpless 115 region and is dominated by that emission nebula. This region is within the Cygnus-X star forming area - there are Dickel, Wendker, and Bieritz (DWB) catalog entries for this field (10 DWB objects). The little red object at the upper right is Sharpless 116 - it also has a planetary Nebula designation since prior to 1991 it was thought to be such an object. It is now believed to simple be a Hydrogen emission nebula so the Sharpless designation is more appropriate. The star cluster (Berkeley 90) is surrounded by Sharpless 115 and one of its massive stars provides the emission energy. These objects are identified in the annotated image. This image replaces an earlier image that can be seen in the archives here.    Horizontal FOV is 120'

Image center is approximately - Equatorial 2000: RA: 20h 33m 53s Dec: +46°55'44"