Sh2-126 in Lacerta (Walter Koprolin)

Celestial hemisphere: Northern · Constellation: Lacerta (Lac)

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Sh2-126 in Lacerta

Link: https://nightsky.at/Photo/Neb/Sh2-126_WN.php

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Sh2-126 in Lacerta

Link: https://nightsky.at/Photo/Neb/Sh2-126_WN.php

This is a unique region in southern Lacerta where a bluish-green molecular cloud (LBN 437) is superimposed on a large red emission nebula (Sh2-126) and forms a "stellar funnel" which includes a symmetrical reflection nebula!

I started taking this exposure series during my astrophoto expedition high up into the Austrian Alps in September 2020 and finished it in my light-polluted backyard two month later. The total exposure time adds up to 30 hours: 9 hours under dark mountain skies for broadband color, 10 hours for narrowband Hα in my backyard, and 11 hours for narrowband [OIII], also in my backyard. All of the images were taken with the 4.9" Wright-Newtonian. I used a single-shot color camera for broadband exposures and a monochrome camera for the narrow-band exposures.

Processing steps, starting with the broadband color exposures: File selection and bias/dark/flat calibration, star alignment and image integration, background flattening, color calibration, noise reduction, non-linearization, mixing with tone-mapped Hα/[OIII] narrow-band color image, color correction, star size reduction, local contrast enhancement.

The color images taken in the mountains were of much better depth than the narrow-band images taken in my backyard, but the camera I used was not very sensitive to Hα, so I had to add mainly Hα from the narrow-band exposures. Processing the Hα and especially the [OIII] images was tough, mainly due to the uneven city sky gradients.

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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.

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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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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	Basic success
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Astrometry.net job	4122010
PixInsight job	n/a
PixInsight queue size	n/a
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Sh2-126 in Lacerta

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