M13 Hercules Great Globular Cluster (Aaron Freimark)

Celestial hemisphere: Northern · Constellation: Hercules (Her) · Contains: Hercules Globular Cluster · IC 4617 · M 13 · NGC 6205 · NGC 6207

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M13 Hercules Great Globular Cluster

Powered byPixInsight

M13 Hercules Great Globular Cluster

I returned to M13 during this week's nearly full moon. And I tried a new trick when processing. To stretch the linear image in PixInsight, instead of using Histogram Transformation I used Arcsinh Stretch. This change avoided blowing out the center of the cluster, revealing quite a bit of detail.

Preprocessing
1. Subframe Selector to find and remove subframes with eccentricity ≥ 0.7
2. WeightedBatchProcessing
3. Create preview to crop
4. DrizzleIntegration with Region of Interest to crop to preview
5. Dynamic Background Extraction

L
1. EZ Denoise
2. Arcsinh Stretch

RGB
1. ChannelCombination
2. ImageSolver script
3. Photometric Color Calibration
4. EZ Soft Stretch
5. Convolution to 3.0 StdDev
7. LRGB Combination to apply L, with 0.3 saturation; then repeat using color noise reduction
8. Dynamic Background Extraction AGAIN to remove some gradient I missed the first time
9. Curves Transformation to touch up color
10. Export to 16-bit TIFF
11. (Still in PixInsight) CurvesTransformation to brighten stars more (paying attention to the background doh!), and export that to TIFF
12. Open TIFFs in Photoshop, and stack with brighter stars in the background
13. Use eraser tool to punch holes in the top layer, allowing a handful brighter stars to show through (gives a bit of a 3D effect)
14. Adjust Levels a bit to darken background
15. Increase Saturation using a layer mask, to selectively saturate just a few stars and that little galaxy
16. Export to TIFF, clean in Topaz Denoise.

Mid-Hudson Astronomical Association (MHAA)
Northeast Imagers

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Status	Advanced success
Started	...
Astrometry.net job	5780812
PixInsight job	TJTIY9WMMZXUL6BMDLYZ31L1MTNSXBZ1
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	16h41m40s.235
RA (top/left)	16h42m59s.343
RA (top/right)	16h44m38s.609
RA (bottom/right)	16h40m19s.749
RA (bottom/left)	16h38m44s.150

Dec (center)	+36°27′29″.65
Dec (top/left)	+35°45′42″.40
Dec (top/right)	+36°54′23″.77
Dec (bottom/right)	+37°09′15″.19
Dec (bottom/left)	+36°00′19″.40

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M13 Hercules Great Globular Cluster

M13 Hercules Great Globular Cluster

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Image Index:

Contribution Index (beta):

M13 Hercules Great Globular Cluster

M13 Hercules Great Globular Cluster

Equipment

Acquisition details

Description

Comments

Sky plot

Histogram

In these public groups

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