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IC 4701 and NGC 6596 in Sagittarius



Scope: Explore Scientific MN152 Maksutov Newtonian at f/4.8, Location: Tierra Del Sol - SDAA Club Site, CA, 9 /13 July, 2018,  Camera: Atik 383L (Astronomik Gen 2 Ha LRGB Filters)

Exposure: Exposure: 8 x 8 min  (1x1 bin) exposure with UV/IR block, 12 x 10 minutes (2x2 bin)  exposure with Hydrogen Alpha filter, 8 x 4 min (2x2 bin) RGB exposures.

Processing: Data Collection -  Sequence Generator Pro (as FITs).  Calibrated, stacked (Kappa Sigma Combine) - Deep Sky Stacker. LRGB channel registration, equalization, gradient removal - Astroart.  Curves, Levels, RGB combine - ImagesPlus. Luminance Layering, final stretch, and finishing  - Photoshop.  RGB calibration - eXcalibrator. This image is a  RGB combine with Luminance layering.  Color saturation in LAB color.  The H-Alpha filter exposure was screen blended into the IR/UV Blocking filter exposure stack and used for the luminance layer. Ha was screen blended slightly into the Red channel -  emission balance of RGB done with Channel Mixer in Photoshop. Images processed at 3352 x 2532 resolution. Final Image size is approximately  2600 x 1950.

North is up in this image.  The large red emission nebula is IC 4701; it is also known as LBN 56 and Sharpless 44. Open Cluster NGC 6596 and reflection nebula vdB 120 are also seen in this image. The vdB 120 reflection nebula is illuminated by the bright blue star HD 167746. However, the heavy emission in the region tends to overpower the normal blue hue of the reflection nebula - but its structure is still seen pretty clearly. This region contains a busy star field and is at  a dense part of the Milky Way. As such, there is substantial galactic material  and numerous dark regions. The more prominent Dobashi objects are indicated in the annotated image, but in this field there are about 199 dark nebulae from the Spitzer Dark Cloud catalog - too numerous to try to annotate.  These objects  are identified in the annotated image.  Horizontal FOV is approximately 88 arc minutes.

Image center is approximately - Equatorial 2000: RA: 18h 16m 25.8s Dec: -1644'14"


All images and content remain the property of Jim Thommes - copyright 2003 - 2018

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