Cygnus wall - NGC 7000 HSO - RGB stars (Thomas Ammann)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: HD199547 · HD199956 · HD200060 · HD200311 · HD200407 · LBN 354 · LBN 373 · LDN 935 · Sh2-117

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Cygnus wall - NGC 7000 HSO - RGB stars

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Cygnus wall - NGC 7000 HSO - RGB stars

Cygnus Wall – NGC 7000 – Caldwell 20

Cloud of Ha forming an emission nebula near Deneb, a bright star in the constellation Cygnus.

The nebula lies at about 2000 – 3000 AL, is very bright and for this reason an easy-to-imagine object in the Hubble palette.

However, I am still impressed by the fine detail made visible by using my new telescope, the TEC 140:
- Ha: 60 x 300sec
- OIII: 43 x 300sec
- SII: 42 x 300sec
(12h)

I still have to learn a lot, to master it perfectly, but the following observations can already be made based on about 6 nights:

a) the diameter of 140mm makes it possible to capture as many light/photons as the sum of my Tak FSQ-85 and FSQ-106; combining the resulting Takahashi images with the TEC images requires applying the powerful Pixinsight 'staralignment' function with 'distortion correction' – works very well;

b) the quality of the final image made up of TEC-views at 240sec is clearly worse than the image made up of views at 300sec each during one night -> I deduce that it is preferable in my case to do for a night time given a fewer number of frames with a longer exposure time than a high number of frames with a more limited duration – two phenomena help in my opinion considerably: (1) the guidance on an Tak EM-200 mount by the ASIAIR OAL-guide is super perfect (< 0.6 arcsec, so no problem with long duration shots) and (2) post-processing noise tools such as R-C astro (thanks to Russel Croman) can handle the noise of a lower number of shots just fine;

c) for the material: everything well, but the TEX-140 image resulting from the Astro-Phsiks Quad-reducer 0.72 shows a fairly strong chromatic aberration, but only on the extreme edges.

I am very happy to read your comments and observations!

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Status	Advanced success
Started	...
Astrometry.net job	8115977
PixInsight job	LVE6TJNRZO72DI01X48YGKE7NHTHG0WH
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	20h59m43s.80
RA (top/left)	21h02m04s.67
RA (top/right)	20h54m57s.99
RA (bottom/right)	20h57m26s.60
RA (bottom/left)	21h04m27s.61

Dec (center)	+43°49′55″.8
Dec (top/left)	+44°35′52″.7
Dec (top/right)	+44°00′25″.4
Dec (bottom/right)	+43°03′48″.5
Dec (bottom/left)	+43°38′44″.10

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Cygnus wall - NGC 7000 HSO - RGB stars

Cygnus wall - NGC 7000 HSO - RGB stars

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