NGC6820, NGC6823 SHO and RGB (AnaTa)

Celestial hemisphere: Northern · Constellation: Vulpecula (Vul) · Contains: HD185858 · HD185915 · HD186021 · HD186310 · HD186412 · LBN 135 · NGC 6820 · NGC 6823 · PK059-00.2 · Sh2-86

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NGC6820, NGC6823 SHO and RGB

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NGC6820, NGC6823 SHO and RGB

RGB for annotation was captured during about 35 min .
Main image is SHO and has combines SHO SNR of 105. O3 is really problematic. Perhaps, 3nm O3 is not suitable for F3.3 scope.
Panel A: SHO
Panel B: RGB annotation

Processing:
RGB are combined.
Cropping for Ha, O3, S2 and RGB
DBE for O3 and RGB. This step is critical to avoid subtracting nebulosity. Hence, this step was not applied for Ha and S2.
Color Colib for RGB
Blur and Noise XT for Ha, O3, S2 and RGB
Star XT for RGB. RGB stars were kept.

Manual stretching (with HT) for Ha, O3, S2, RGB (no stars), and RGB-stars (two different stretching).
Stretched RGB-stars were saved as two files (more and lesser stretched).

1. Processing (panel B)
RGB no stars were masked by Lum.
Local Histogram Equalization: Kernel radius of 40 and 150
Multiscale-median transform for sharpness; strong 0.4-0.5 setting.
Curves: brightness is manipulated
Mask off.
Added RGB stars (brighter version of stars).
Annotation

1. Processing (panel A)
Combined SHO as R-G-B
Noise XT
Stretched again.
Star XT. These stars were discarded.
Played with Hue-Saturation until final image.
Lum for SHO was used as mask.
Local Histogram Equalization: Kernel radius of 40, 150 and then 300 (histogram resolution is 10-bit!)
Multiscale-median transform for sharpness; strong 0.4 setting.
Curves: saturation and brightness are manipulated
Blue was separately manipulating using "blue mask".
Mask off.
Added RGB stars (dimmer version of stars).
Done

Original
Final
B

Nebulas (Emission)

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Other
Unknown

The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

Submitted The date and time when you submitted this image for IOTD/TP consideration.	...
Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
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Status	Advanced success
Started	...
Astrometry.net job	8562578
PixInsight job	O59SVY5JI2DKM7O7W6I48ZGN4APHD60W
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	19h42m53s.44
RA (top/left)	19h46m03s.92
RA (top/right)	19h39m36s.56
RA (bottom/right)	19h39m45s.14
RA (bottom/left)	19h46m08s.14

Dec (center)	+23°11′02″.4
Dec (top/left)	+23°55′58″.10
Dec (top/right)	+23°54′29″.6
Dec (bottom/right)	+22°25′52″.5
Dec (bottom/left)	+22°27′19″.9

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NGC6820, NGC6823 SHO and RGB

NGC6820, NGC6823 SHO and RGB

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Image Index:

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NGC6820, NGC6823 SHO and RGB

NGC6820, NGC6823 SHO and RGB

Equipment

Acquisition details

Description

Comments

Revisions

Sky plot

Histogram

In these collections

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