Cave Nebula SH2-155


Scope: C8  f/2.8 Location: Laguna Mountains, CA;   17 Sept. 2004  Camera: ToUcam SC3

Exposure: 15 x 60 sec and 12 x 16 sec Luminance exposures with Baader IR Block Filter, 6  x 240 sec H-Alpha exposure; 12 x 32 sec RGB

Processing: Images were captured in K3CCDTools. Aligned/stacked in Registax and saved as FITS. Luminance and Color channels were scaled and rough color balanced in Astroart. Channels were co-registered in Astroart. The Nebulosity was extracted from HA and then combined with the 60 sec IR  for Luminance in Photoshop - The 16 sec IR was used to minimize some star bloating. Extracted nebula from HA was used to provide  a very small amount of false color for the nebula in the  Red channel. Luminance and Color FITS were combined in Photoshop with Luminance Layering. Color balancing and final touches in Photoshop. SGBNR (PixInsight LE) was used to smooth background noise on  Luminance channel as well as the final result. Image was resized to 800 x 600.

This image was taken  at a dark site with little light pollution. This is a guided image.  This object is referenced in two catalogues Caldwell 9 and SH2-155. It is also popularly known as the Cave Nebula. This object is located in the constellation of Cepheus. One distinctive feature is the dark area left of the bright nebula with few stars. This is a region of dust obscuring the star field behind it. Horizontal FOV is about 30'


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