Sh2-231, - 232, -233 and -235, SHO and RGB (AnaTa)

Celestial hemisphere: Northern · Constellation: Auriga (Aur) · Contains: HD37670 · HD37737 · HD37767 · LBN 802 · LBN 803 · LBN 805 · LBN 808 · LDN 1525 · PK173+03.1 · Sh2-231 · Sh2-232 · Sh2-233 · Sh2-235

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Sh2-231, - 232, -233 and -235, SHO and RGB

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Sh2-231, - 232, -233 and -235, SHO and RGB

RGB was captured during 38 min from bortle 8.
Main image SHO is very low and has SNR of 15. Then there is RGB annotation.
O3 is very week.
Panel A: SHO
Panel B: RGB annotation

Processing:
Cropping for Ha, O3, S2, R, G and B
GraXpert for each panel.
RGB are combined.
DBE for RGB. 4 points were used.
Color Colib for RGB
Blur and Noise XT for Ha, O3, S2, and RGB panels
Star XT for Ha, O3, S2, and RGB. RGB stars were kept, B, Ha, O3 and S2 stars were discarded.

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)
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 ("more stretched" version).
Annotation

1. Processing (panel A)
Combined S2, H and O3 as R-G-B
Noise XT
Stretched again.
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
Yellow-Red and Blue were manipulated with separate Yellow and Blue masks.
Mask off.
Added RGB stars ("lesser stretched" version).
Done

Original
Final
B

Nebulas (Emission)

Please note: The following tables are updated every 24 hours.

Distribution of astrophotographers

This table shows the number of distinct astrophotographers who have been assigned and IOTD/TP award compared to the total number of images awarded.
	Distinct awarded users	Total awarded images
Image of the day
Top picks
Top pick nominations

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
Deep sky
Solar system
Extremely wide field
Star trails
Northern lights
Noctilucent clouds
Landscape

Distribution of data sources

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	9002238
PixInsight job	93EOK8V4CTNI22RGL5LISWPZVT5PYNCK
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	05h41m37s.31
RA (top/left)	05h45m18s.16
RA (top/right)	05h37m54s.56
RA (bottom/right)	05h38m00s.60
RA (bottom/left)	05h45m15s.93

Dec (center)	+36°04′08″.8
Dec (top/left)	+36°48′31″.3
Dec (top/right)	+36°48′08″.3
Dec (bottom/right)	+35°19′20″.9
Dec (bottom/left)	+35°19′43″.5

Image Index:

Contribution Index (beta):

Sh2-231, - 232, -233 and -235, SHO and RGB

Sh2-231, - 232, -233 and -235, SHO and RGB

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Image Index:

Contribution Index (beta):

Sh2-231, - 232, -233 and -235, SHO and RGB

Sh2-231, - 232, -233 and -235, SHO and RGB

Equipment

Acquisition details

Description

Comments

Revisions

Sky plot

Histogram

In these collections

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