The Great Wall in Cygnus in Halpha

Great Wall

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Location / Date

Zellerndorf, 09./10. June 2014

Telescope / Mount / Guiding

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

Camera / Exposure

Canon EOS 500Da mono with Astronomik Hα-Clip-Filter
32 x 15min ISO 1600 (total 8h)


Theli, Fitswork, PixInsight, Photoshop


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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