The Great Wall in Cygnus

Great Wall

MouseOver for object identification, Click on image for a zoomable version

Location / Date

Zellerndorf, June - September 2014

Telescope / Mount / Guiding

ASA 10" Astrograph, ASA 3" Wynne Corrector
ASA DDM60, no Guiding

Camera / Exposure

Canon EOS 500Da
RGB 24 x 15min ISO400 (6h)

Canon EOS 500Da mono
Hα 12nm Astronomik Clip-Filter 37 x 15min ISO1600 (9h 15min)
OIII 12nm Astronomik Clip-Filter 31 x 15min ISO1600 (7h 45min)
SII 12nm Astronomik Clip-Filter 30 x 15min ISO1600 (7h 30min)


Theli, Fitswork, PixInsight, Photoshop

The Hα-, OIII- and SII-images are combined with the RGB-image in their natural colors to get a "natural" look of the image.


The Great Wall (Cygnus Wall) is the southern part of the North America Nebula (NGC 7000) in the constellation Cygnus and exhibits the most concentrated star formations in the nebula. The North America Nebula is an emission nebula close to Deneb (the tail of the swan and its brightest star). The remarkable shape of the nebula resembles that of the continent of North America, complete with a prominent Gulf of Mexico.
The North America Nebula and the nearby Pelican Nebula, (IC 5070) are in fact parts of the same interstellar cloud of ionized hydrogen (H II region). Between the Earth and the nebula complex lies a band of interstellar dust that absorbs the light of stars and nebulae behind it, and thereby determines the shape as we see it. The distance of the nebula complex is about 1600 light years.

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