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Barnard 92 and 93 in Sagittarius



Scope: Megrez II 80 mm  at f/4.8,  Location: Laguna Mountains, CA  5 July,  2008,   Camera: Artemis285

Exposure: 8 x 8 min H-Alpha (1x1), 5 x 2 min IR/UV Block (1x1), 7 x 2 min RGB Exposures (1x1). 

Processing: Images were captured  with Artemis Capture (as FITs).  Aligned/stacked and dark subtracted in Astroart with Sigma Combine.   H-Alpha, IR/UV Block,  and Color channels were scaled and  color balanced in Astroart.  Channels were co-registered in Astroart.   Luminance construction consisted of the H-Alpha exposure; the IR/UV block exposures were used for faint stars.  Curves and Levels applied in Photoshop to the Luminance construction to optimize object features.  Final LRGB combine was done in Photoshop using Luminance Layering in LAB color Space. The H-alpha stack was blended at 30% lighten (with star mask) into the red channel.  A light background noise reduction was applied in PixInsight LE (SBNR).   Final Image size is approximately 1392x1040.

 North is up in this image. The field in this image is from the constellation of Sagittarius. The objects in this image, B92 (right) and B93 (left), are "dark" nebula caused by dense obscuring dust blocking light from more distant stars behind them. The small star cluster in the lower left in NGC 6603. These three objects are estimated to be 10,000 light years distant from Earth. The general reddish hue is the larger emission nebula known as Sharpless 41. The Horizontal FOV is 80'.

Image center is located approximately - Equatorial 2000: RA: 18h 16m 14s Dec: -1812'51"


All images and content remain the property of Jim Thommes - copyright 2003 - 2012

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