M13 LRGB and Light Pollution (Jerry Yesavage)

Celestial hemisphere: Northern · Constellation: Hercules (Her) · Contains: Great Cluster in Hercules · Hercules globular cluster · IC 4615 · IC 4616 · IC 4617 · M 13 · NGC 6196 · NGC 6197 · NGC 6205 · NGC 6207

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M13 LRGB and Light Pollution

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M13 LRGB and Light Pollution

Living in a highly light polluted area I need to use narrow band images. But, I have been trying to figure out the best way to process LRGB. This one turned out pretty well so I thought I would post also my PI recipe for comment.

1. Subframe selection with this selection expression: SNRWeightSigma > -2 && Eccentricity <0.6 && StarSupport > 1050. The StarSupport level is customized to get rid of subs from marginal seeing nights.

2. BatchPreprocessing with Linear Fit. I have not found the dithering helps much.

3. Dynamic Crop of LRGB images.

4. Remove LP gradient with DBE of each LRGB image with 20 (i.e. closely fitting) samples/row. Manually adjust any samples with a star in them (move slightly). Do DBE twice.

5. Linear fit to G of all 4 limages.

6. LRGB Combo of RGB [If I follow above sequence, ColorCalibration may bot be necessary).

7. Stretching with MaskedStretch script (less star bloating) or STF->HT

8. Set black point with HT and CT

9. Add L to RGB image via LRGB combo. L at 0.5 and RGB at 0.2 [drag and drop L on top of RGB].

10. UnsharpMask noise reduction... other noise reduction routines seem to blotch this file.

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Status	Advanced success
Started	...
Astrometry.net job	557341
PixInsight job	OT52L9WU2WV0YQ24NQMXI3VVITA0VB6Q
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	16h41m40s.81
RA (top/left)	16h45m07s.98
RA (top/right)	16h45m42s.22
RA (bottom/right)	16h38m08s.48
RA (bottom/left)	16h37m45s.72

Dec (center)	+36°27′33″.8
Dec (top/left)	+35°25′18″.0
Dec (top/right)	+37°25′07″.7
Dec (bottom/right)	+37°29′29″.5
Dec (bottom/left)	+35°29′33″.4

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M13 LRGB and Light Pollution

M13 LRGB and Light Pollution

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M13 LRGB and Light Pollution

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