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"Cat's Paw" NGC 6334 in Scorpius



Scope: Mak-Newt 152 mm  f/4.8, Location: Laguna Mountains, CA,   14 June 2010  Camera: ST8300M

Exposure:  10 x 7 min H-Alpha Exposure (1x1), 10 x 4 min UV/IR Block Luminance,  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.  All channels were scaled and rough color balanced in Astroart.  Central Gradient removal  was done in Astroart. Channels were co-registered in Astroart. G2V  factors  were applied to color channels in Astroart.  The 7 minute H-Alpha block exposures were combined with the 4 minute luminance exposures  for the main luminance construction with level adjustments and curves to bring out object features.  LRGB combine was done in Photoshop. Saturation adjustments were selectively applied excluding the brighter areas. Bright area exclusion on some portions of Levels, Curves, and Saturation was to avoid core over brightening and out of Gamut.  Background noise reduction was applied in PixInsight LE (SGBNR).   Sharpening was done on the luminance channel. Final touches and color balance in Photoshop. Final Image size is approximately 3352x2532 (resized to 2400x1800).

North is up in this image. NGC 6334 is located in the constellation of Scorpius. This object appears mostly red because it is a Hydrogen Alpha emission nebula and its light travels through a fair amount of interstellar dust to reach Earth. The dust tends to reduce transmission of shorter blue wavelengths and less so the longer red wavelengths.. This image replaces an earlier image of this region and can be seen in the Archives here.    Horizontal FOV is 83 arc minutes.

Image center is approximately - Equatorial 2000: RA: 17h 19m 48s Dec: -3554'40" 

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

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