Sh2-173, The Phantom of Opera Nebula. HSO (AnaTa)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: 12 Cas · HD1166 · HD1239 · HD1383 · HD1400 · HD1544 · HD1613 · HD1697 · HD1743 · HD1810 · HD1843 · LBN 592 · LBN 593 · LDN 1282 · LDN 1283 · NGC 103 · Sh2-173 · The star 12 Cas

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Sh2-173, The Phantom of Opera Nebula. HSO

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Sh2-173, The Phantom of Opera Nebula. HSO

Sh2-173 HSO was used for annotation (panel C). Panel B is cropped version. O3 showed almost nothing.
Main image has combined HSO SNR of 250.

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 and SHO. SHO stars were discarded. RGB stars were kept.

Manual stretching (with HT) for Ha, O3, S2, RGB (all of them no stars), and RGB-stars (low intensity stretching).
Stretched RGB-stars were saved for HSO images.

Combined HSO as R-G-B
Noise XT
Stretched again.
Played with Hue-Saturation until final image.
Lum for HSO 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
Mask off.
Added RGB stars.
Annotation for panel C
Cropping for panel B
Main image is on panel A (no annotation and no cropping)
Done

Original
B
Final
C

Nebulas (Emission)

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	Distinct awarded users	Total awarded images
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Distribution of subject types

This table shows the distribution of awards per subject type, compared to the popularity of images of that subject type.
	Image of the day	Top pick	Top pick nominations	Total submitted
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This table shows the distribution of awards per data source, compared to the popularity of images acquired from that data source.
	Image of the day	Top pick	Top pick nominations	Total submitted
Backyard
Traveller
Own remote observatory
Amateur hosting facility
Public amaeteur data
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	8658292
PixInsight job	ZKOCAIQ40XQ6TWSNWOEL3PIUUCX0SBBY
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	00h21m54s.31
RA (top/left)	00h28m15s.40
RA (top/right)	00h15m28s.80
RA (bottom/right)	00h15m51s.13
RA (bottom/left)	00h28m01s.98

Dec (center)	+61°45′53″.6
Dec (top/left)	+62°29′53″.1
Dec (top/right)	+62°29′19″.4
Dec (bottom/right)	+61°00′51″.4
Dec (bottom/left)	+61°01′22″.7

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Sh2-173, The Phantom of Opera Nebula. HSO

Sh2-173, The Phantom of Opera Nebula. HSO

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Sh2-173, The Phantom of Opera Nebula. HSO

Sh2-173, The Phantom of Opera Nebula. HSO

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Description

Comments

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