NGC7023 - Iris, Ghost Nebula and Dark Nebula - LRGB (Martin Dufour)

Celestial hemisphere: Northern · Constellation: Cepheus (Cep) · Contains: HD198385 · HD198737 · HD200099 · HD200775 · HD202181 · Iris Nebula · LBN 468 · LBN 475 · LBN 483 · LBN 487 · LBN 495 · LDN 1155 · LDN 1158 · LDN 1167 · LDN 1168 · LDN 1170 · LDN 1171 · LDN 1172 · LDN 1173 · LDN 1174 · LDN 1177 · NGC 7023 · Sh2-136 · T Cep · VdB141

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NGC7023 - Iris, Ghost Nebula and Dark Nebula - LRGB

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NGC7023 - Iris, Ghost Nebula and Dark Nebula - LRGB

I live in Canada in the province of Quebec, and it's one of the best places to live! However, when it comes to the quality of the sky and the number of nights suitable for astrophotography, we are not very fortunate. It's easier to understand why most astrophotographers opt for shorter exposure times.

I had been dreaming for a long time of capturing a photo with a very long exposure time. While browsing the NGC catalog, I noticed that NGC7023 is at an altitude of more than 40 degrees from May to November, so I thought, why not focus on this target! That's what I did. Every time the sky was suitable, even if it was just for a few hours, I set up my kit, which allowed me to capture a luminance layer and an OSC layer (using 2 telescopes on one mount).

So, from May 17, 2023, to September 23, 2023, I was able to capture hundreds of luminance frames of 300 seconds each and hundreds of OSC frames of 300 seconds each, all over 22 nights! Afterward, I went through hundreds of frames to keep 777 that passed the quality control.

Have you ever stacked 777 frames? I have a state-of-the-art I9 with 32GB of RAM on an SSD, and it took approximately 5 hours! I deliberately processed the stars separately to emphasize the details of the nebula. This allows those who don't like starless images to appreciate my work and brings out the many details of the nebula.

Enjoy the view!

AstroWorld TV
ASI 6200 MM Pro
The OSC Club (One Shot Camera)
Astro-Québec

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	Distinct awarded users	Total awarded images
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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	...
PixInsight job	F1OWWX1G0XWKQDXMAUTAKBXPT35UAMLQ
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	21h01m56s.83
RA (top/left)	21h26m19s.85
RA (top/right)	20h45m59s.21
RA (bottom/right)	20h38m40s.50
RA (bottom/left)	21h15m30s.55

Dec (center)	+68°04′32″.10
Dec (top/left)	+68°30′37″.2
Dec (top/right)	+69°52′10″.6
Dec (bottom/right)	+67°25′34″.4
Dec (bottom/left)	+66°12′09″.3

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NGC7023 - Iris, Ghost Nebula and Dark Nebula - LRGB

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NGC7023 - Iris, Ghost Nebula and Dark Nebula - LRGB

NGC7023 - Iris, Ghost Nebula and Dark Nebula - LRGB

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