M19, globular cluster, LRGB (AnaTa)

Celestial hemisphere: Southern · Constellation: Ophiuchus (Oph) · Contains: M 19 · NGC 6273

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M19, globular cluster, LRGB

Revision title: Main panel

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M19, globular cluster, LRGB

Revision title: Main panel

M19 is a bright (6.8 Mag) and large sized (17') globular cluster in the constellation of Ophiuchus.  M19 has a 3′ × 4′ core. This cluster contains an estimated 1,100,000 times the mass of the Sun and is around 11.9 billion years old. M19 is one of the most oblate of the known globular clusters.
This image was generated in 2023 from backyard. Now, it was completely re-processed to clearly show as much as possible core of the cluster. It could be said that the original processing was very good as well. I kept original picture. SNR of cluster is about 19.

Processing:
WBPP was used to calibrate, normalize and integrate Lights using for calibration Darks, Flats and Dark Flats.
R, G, B and Lum were slightly cropped.
GraExpert applied for R, G, B and Lum. GraExpert produced noticeable effect, since image captured at bortle 8.
RGB were combined.
SCPP was used for color calibration.
Blur and Noise XT for RGB and Lum.
Stretching required gradual application of wider and wider masks generated in GAME script.
Manual stretching for RGB and Lum were done using HT.
Noise XT, and then stretch again.
Mask with Lum.
LHE was applied: 40 and 150 Kernes radius (setting 0.2).
Then MMT was applied for sharpening (setting 0.02-0.03).
Curve was used for star saturation adjustments.
Blue and Yellow masks were used to enhance blue and reddish stars.
Mask with Lum was used for overall star saturation.
Annotation is the panel C
Main image is the panel D
Original image is on the Panel B.

Original
C
Final
D

D

Title: Main panel

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Status	Advanced success
Started	...
PixInsight job	ZDDON45O0UNCOQSOLTF3Z8RLN6E30WNO
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	17h02m38s.297
RA (top/left)	17h01m48s.974
RA (top/right)	17h03m28s.382
RA (bottom/right)	17h03m27s.646
RA (bottom/left)	17h01m48s.381

Dec (center)	-26°16′29″.32
Dec (top/left)	-26°27′41″.77
Dec (top/right)	-26°27′34″.59
Dec (bottom/right)	-26°05′16″.77
Dec (bottom/left)	-26°05′23″.66

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M19, globular cluster, LRGB

Revision title: Main panel

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M19, globular cluster, LRGB

Revision title: Main panel

M19, globular cluster, LRGB

Revision title: Main panel

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