IRIS Nebula - NGC 7023 - L-RGB (Thomas Ammann)

Celestial hemisphere: Northern · Constellation: Cepheus (Cep) · Contains: HD200775 · Iris Nebula · LBN 487 · LDN 1168 · LDN 1170 · LDN 1172 · LDN 1173 · LDN 1174 · NGC 7023

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IRIS Nebula - NGC 7023 - L-RGB

Revision title: Version 2

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IRIS Nebula - NGC 7023 - L-RGB

Revision title: Version 2

The reflection nebula NGC 7023, which shines at magnitude +6.8, is illuminated like a beautiful flower by a magnitude +7.4 Herbig-Haro star designated HD 200775 and has been discovered by the German-British astronomer William Herschel in 1794. It is located in the magnificent darker and wider reflection nebula LBN 487.

Imaging this beautiful nebula has been a dream since the beginning of my Astro-photo activities three years ago. Only the switch to a brighter optics made it possible to take 142 images at 5 min during 2 clear nights in autumn 2023. In mountainous western Switzerland the second night was unfortunately shortened by a mountain horizon that was too high ;-)

Despite only nearly 12 hours of exposure, I'm quite happy with the result : the post-processing was particularly laborious due to the very bright core of the nebula in a darker environment. Finally, I discovered that the 300 second images contain more information in the bright region than the 30 second images also made to record for the heart, and the stars. To extract this more information from images with longer exposure times I finally decided against an HDR composition. A nice learning experience with L-RGB processing - not so easy ;-)

Thanks to Ola Skarpen whose model-image from April 25, 2023 guided me throughout the treatment - outstanding!

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Status	Advanced success
Started	...
Astrometry.net job	8900534
PixInsight job	M10USQ4PGFAEYITNY79VKTTA4ONCNE60
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	21h01m03s.830
RA (top/left)	21h03m30s.698
RA (top/right)	21h08m27s.653
RA (bottom/right)	20h58m26s.837
RA (bottom/left)	20h54m00s.350

Dec (center)	+68°05′03″.48
Dec (top/left)	+67°18′12″.59
Dec (top/right)	+68°31′40″.39
Dec (bottom/right)	+68°51′45″.40
Dec (bottom/left)	+67°37′23″.52

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IRIS Nebula - NGC 7023 - L-RGB

Revision title: Version 2

IRIS Nebula - NGC 7023 - L-RGB

Revision title: Version 2

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IRIS Nebula - NGC 7023 - L-RGB

Revision title: Version 2

IRIS Nebula - NGC 7023 - L-RGB

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