Wolf-Rayet stars are evolved, massive stars that have shed their outer layers, revealing a hot and dense core. WR 136 is no exception, displaying strong stellar winds that propel material into space. These winds create a nebula around the star, contributing to the surrounding interstellar environment.

The binary nature of WR 136 adds another layer of interest. The companion star, which is not a Wolf-Rayet star, orbits the primary star, influencing its evolution and contributing to the dynamics of the system.

NGC 6888, known as the "Crescent Nebula," is an emission nebula located in the constellation Cygnus. It's formed by the powerful stellar wind from a Wolf-Rayet star colliding with the surrounding interstellar material, creating its distinctive crescent shape. A fascinating aspect of this nebula is the presence of intricate, filamentary structures illuminated by the energetic radiation emitted by the central star, resulting in a captivating interplay of light and gas.

Image Description and Details : Three panel mosaic of the central region of Cygnus constellation. From left to right, in order of appareance, the North America Nebula (NGC 7000), the Pelican Nebula (IC 5070), the Butterfly Nebula (IC 1318), the Crescent Nebula. At the bottom right, some molecular clods and dark nebulae.

Framing was planned with the software NINA, the single subs stacked with DeepSkyStacker, and the panels merged with Astropixelprocessor. Processing with Pixinsight and Photoshop.

Gear and technical data:
Samyang 135 @ f/4
QHY183C
Optolong L-enhance filter
30 subs x 3 panels x 180s

Copyright: Antonio Grizzuti

34hr 31min⁣ total exposure time⁣⁣

96x300” Ha

⁣119x300” Oiii⁣

150x60” R

⁣66x60” G

⁣74x60” B⁣

40x Darks⁣360 Flats/Dark Flats⁣06/13-15,06/17-18, 06/21-22, 07/22, 08/03, 08/13/2021⁣Bortle 6⁣/7⁣Calgary, AB⁣⁣Setup#1⁣ - HHOHO 711mm Focal Length⁣william optics GT102⁣william optics Flat68iii⁣antlia filters HO 3nm, 2”⁣antlia filters RGB, 2”⁣sky watcher usa EQ6-R Pro⁣zwo asi ASI2600MM-Pro, unity, -10C⁣zwo asi EAF⁣zwo asi EFW 7x2, 2”⁣zwo asi OAG⁣68M⁣zwo asi ASI290MM-mini⁣⁣zwoasi ASIAir Pro⁣

⁣APP, PI⁣, PS, MLR⁣

Copyright: Andrew Lesser

Image Description and Details : Widefield image of a nebula-dense region in the constellation Cygnus. The image contains the crescent nebula in the top right and the tulip nebula in the lower left.

OIII: 120x300" (10h) bin 1x1
Hɑ: 135x300" (11h 15') bin 1x1
SII: 106x300" (8h 50') bin 1x1
Gain: 111.00; -15C

Total Integration: 30h

Camera: ZWO 183MM Pro
Lens: Rokinon 135 f/2
Mount: Sky-Watcher EQ6R Pro


Copyright: Frank Turina

I have started this imaging project back at 2010. My aim was to make a high resolution mosaic covering the constellation Cygnus. Work like that takes time and patience, especially since I have worked so, that many of the individual sub mosaics or frames have been published as an individual artworks. Here is a poster format presentation about all of longer focal length images used for this mosaic beside wide field panels.

As a result I have now a huge 37 panel (And 58 long focal length sub-panel) mosaic panorama covering 28 x 18 degrees of sky.  I have collected photons way over 600 hours during past ten years for this photo. The full size mosaic image has a size of about 25.000 x 15.000 pixels.

In the orientation image above, there are three large supernova remnants visible, first the Cygnus Shell W63 , bluish ring at upper left quarter, secondly the large SNR G65.3+5.7 at utmost right and finally the third is a brighter SNR, the Veil nebula just outside of field of view at bottom center. (Image is partly overlapping with large mosaic but I didn't want to include it yet due to artistic composition.)Beside three supernova remnants there are two Wolf Rayet stars with outer shell formations. NGC 6888, the Crescent Nebula at center of the image and the WR 134, it can be seen as a blue arch just right from the Crescent Nebula, near the Tulip nebula.Next to the Tulip Nebula lays a Black hole Cygnus X-1, it's marked in small closeup image of the Tulip Neula at center right in orientation image above.

There are 37 base panels with shorter focal length tools (300mm f2.8 Tokina and 200mm f1.8 Canon) There is also 59 sub-panels used, they are shot with my old 12" Meade and 11" Celestron Edge scopes.

Copyright: J-p Metsavainio