Sh2-184, NGC281, Pacman Nebula (SHO & RGB) (AnaTa)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: HD4647 · HD5005 · HD5032 · IC 1590 · LBN 611 · LBN 615 · LBN 616 · LBN 621 · NGC 281 · Sh2-184

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Sh2-184, NGC281, Pacman Nebula (SHO & RGB)

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Sh2-184, NGC281, Pacman Nebula (SHO & RGB)

RGB was captured during only 36 min from bortle 7.
Main image is SHO and has whooping SNR of 420. Then there are RGB version and RGB annotation
Panel A: SHO
Panel B: RGB
Panel C: RGB annotation

Processing:
RGB are combined.
Cropping for Ha, O3, S2 and RGB
DBE for Ha, O3, S2 and RGB. This step is critical to avoid subtracting nebulosity. Just 5 squares (50 size) were used in DBE.
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.
Stretched RGB-stars were saved as two files (more and lesser stretched)

1. Processing (panel B and C)
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.
Annotation

1. Processing (panel A)
Combined SHO as R-G-B
Noise XT
Stretched again.
Star XT. These stars were not kept.
Played with Hue-Saturation until final image. Foraxx did not work. PixelMath was not used.
Lum for SHO was used as mask
Local Histogram Equalization: Kernel radius of 20, 150 and then 300 (histogram resolution is 10-bit!)
Multiscale-median transform for sharpness; strong 0.4-0.5 setting.
Curves: brightness is manipulated
Mask off.
Added RGB stars.
Done

Original
B
Final
D

Nebulas (Emission)

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Distribution of astrophotographers

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	Distinct awarded users	Total awarded images
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	Image of the day	Top pick	Top pick nominations	Total submitted
Deep sky
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	Image of the day	Top pick	Top pick nominations	Total submitted
Backyard
Traveller
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Amateur hosting facility
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Professional, scientific grade data
Mix of multiple sources
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.
Promotions by Submitters When 3 distinct Submitters promote the image, it moves on to the next stage of the process: evaluation for Top Pick status. This requirement, in addition to anonymization of images and distribution to only a subset of them, prevents biases and ensures that the best images are selected.
Promotions by Reviewers When 3 distinct Reviewers promote the image, it moves on to the next stage of the process: evaluation for IOTD status.
Early dismissal Staff members have a lot of images to inspect on a daily basis, and they can dismiss images if they believe they don't meet the requirements for IOTD/TP selection. If an image is dismissed 5 times, it's removed from the process. This streamlines the process and ensures that any bias present in promotions could be overruled by other staff members.

Status	Advanced success
Started	...
Astrometry.net job	8504485
PixInsight job	VA8V6YHN6K8J42HKYD44M68O6QO4TJF2
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	00h52m26s.60
RA (top/left)	00h46m56s.57
RA (top/right)	00h47m12s.87
RA (bottom/right)	00h57m41s.87
RA (bottom/left)	00h57m51s.25

Dec (center)	+56°40′21″.1
Dec (top/left)	+57°23′38″.8
Dec (top/right)	+55°55′35″.4
Dec (bottom/right)	+55°56′03″.8
Dec (bottom/left)	+57°24′12″.2

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Sh2-184, NGC281, Pacman Nebula (SHO & RGB)

Sh2-184, NGC281, Pacman Nebula (SHO & RGB)

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Image Index:

Contribution Index (beta):

Sh2-184, NGC281, Pacman Nebula (SHO & RGB)

Sh2-184, NGC281, Pacman Nebula (SHO & RGB)

Equipment

Acquisition details

Description

Comments

Revisions

Sky plot

Histogram

In these collections

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