IC 4701 and NGC 6596 in Sagittarius
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CLICK ON IMAGE FOR FULL SIZE VIEW (2600x1950) 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: -16°44'14"
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