Iris Nebula NGC 7023 at long focal length (GalacticRAVE)

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

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Iris Nebula NGC 7023 at long focal length

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Iris Nebula NGC 7023 at long focal length

This image came out as a bit of an experiment. After 4 weeks of white nights ( a trip to the North Cape in Norway), I was keen to image again. The weather was good, however, we were approaching full moon but I was not in the mood of doing narrow band. But the full moon is only some 10° over the horizon at 52N, Iris nebula is culminating in the north, so at Bortle 6ish this is a risk one can take, I think. Furthermore, I am not fully satisfied with the performance of Celestron's LF reducer (as many others), so I decided to play with the full focal length. The high f - ratio I compensated with convolution binning, but the field of view is rather small. One the other hand, that way one can concetrate on the inner part of the Iris nebula. Owing to the small FOV, however, there is basically no sky and only nebulosity on the image, so background modelling is tricky. Probably the proper way is to do multi scale background extraction, but I don't have a large FOV image available. So I resorted to the PI's automatic background extraction with a N=2 fit with division to compensate for residual vignetting and an N=1 fit with substraction to compensate for light pollution. finally, I started to use photoshop for the final touches (mainly color work), feeling not really comfortable with that tool yet (practice, practice, practice). But at the end, I am reasonably happy with my first shot at this beautiful reflection nebula.

Data were taken on August 8, 9, and 10.

Original
Final
C

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Reflection Nebula

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Status	Advanced success
Started	...
Astrometry.net job	6142532
PixInsight job	QHMRK4EYIR4K8999VG3Z2VJE4XJBOU9W
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	21h00m54s.786
RA (top/left)	21h02m57s.514
RA (top/right)	20h58m50s.800
RA (bottom/right)	20h58m53s.567
RA (bottom/left)	21h02m58s.404

Dec (center)	+68°09′44″.12
Dec (top/left)	+68°17′27″.84
Dec (top/right)	+68°17′08″.83
Dec (bottom/right)	+68°01′54″.18
Dec (bottom/left)	+68°02′13″.20

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Iris Nebula NGC 7023 at long focal length

Iris Nebula NGC 7023 at long focal length

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Iris Nebula NGC 7023 at long focal length

Iris Nebula NGC 7023 at long focal length

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