The Propeller Nebula is located in the region of Cygnus streaming with gas, in particular hydrogen as evidenced from the image. Many popular objects are located within this rich gaseous region and the Propeller often gets included as part of a wide field image. The exact distance is not known, however, the Cygnus Complex is approximately 4,6oo light-years away. The object is a hydrogen gas emission nebula that happens to resemble a giant propeller, hence the name.

The most common designation is DWB 111, however, this is only part of the object and named after H. R. Dickel, H. Wendker, and J. H. Bieritz, who were studying and cataloging HII regions in the Cygnus X Complex in the 1960s. DWB 119 was the other half of the object. The earlier Simeiz Catalog was created in the 1950s by the Crimean Astrophysical Observatory at Simeiz in Ukraine (Russia annexed Crimea in 2014). This object was number 57 in that catalog so the designation for the whole object is Simeiz 57 (a.k.a. Simeis 57) .

So you may have noticed I captured it over a month ago and only now publishing it, this is due to a variety of factors including a lot of software and hardware glitches. One of my issues was that my laptop computer was seriously underpowered and some programs such as Topaz Denoise (new update) would no longer work. I now have a zippy desktop for processing and everything works and is much faster. This image is the first one where I used the new computer (partially). The data was collected using the IDAS NBZ filter which collects only hydrogen alpha (Ha) and oxygen III (OIII). I separated the Ha into the red channel and the OIII was a combo between green and blue where green was a higher percentage. The image is a close approximation of an monochrome HOO combo yet taken with a color camera (or that is the idea). This is a dimmer object than it appears so I am happy with the outcome.

Dates: 6-17, 6-19, 6-28

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