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Thread: Simeis 57, the Propellor Nebula

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    Default Simeis 57, the Propellor Nebula



    Here's a photo from a few nights ago that I finally got around to processing. This is a nebula usually called the Propellor Nebula; it is in the nebula-rich area of Cygnus around Deneb and Sadr, about 4 degrees NNW of Sadr (Gamma Cygni).



    Most mentions of this nebula on the internet refer to it as DWB 111. This made me curious (what is this DWB catalogue anyway?) so I tracked down the paper in which the DWB catalogue was introduced (Dickel, Wendker, and Bieritz, "The Cygnus X Region: V. Catalogue and Distances of Optically Visible H II Regions", Astronomy & Astrophysics, Vol. 1, p. 270, 1969); the letters DWB are the initials of the authors' surnames. The DWB catalog comprises 193 nebulae, all contained in a roughly 3x4-degree rectangle around Sadr. Most of these nebulae are non-famous ones with the exception of the Crescent Nebula (which is DWB 19) and the Sadr nebula complex (which consists of several DWB entries).

    By reading the DWB paper I also discovered that it is, if not incorrect, at least misleading to use the designation DWB 111 for the Propellor Nebula, as the main nebula consists of three DWB objects (111, 119, and 118), and there are seven other DWB objects in the area. Here are the different DWB nebulas in my photo labelled with their numbers:



    So is there a name for the Propellor Nebula as a whole? The answer is yes. I found another paper (Israel, Klppenburg, Dewdney, and Bally, "The peculiar nebula Simeis 57", Astronomy & Astrophysics, Vol 398, page 1063, 2003) which says that the whole Propellor Nebula is item #57 in another (as-yet-unheard-of by me) catalog called "Simeis", and therefore is known as "Simeis 57". As a reference they give two papers by Gaze and Shajn published in (and I quote) "Izv. Krym. Astrofiz. Obs." in the 1950's. With a bit of digging I eventually figured out that the full journal name is "Isvestiy Krymskoi Astrofizichesko Observatori", a Ukranian journal whose title translates as "Notices of the Crimean Astrophysical Observatory". But why is the catalogue name "Simeis"? With a little more digging I found that the Crimean Astrophysical Observatory has had two facilities in the Ukraine: one in Nauchny and one in...Simeis!

    I hope you've enjoyed this little adventure amongst the astronomical catalogues, as well as the picture of Simeis 57, the Propellor Nebula.

    - Mike
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  2. The Following 7 Users Say Thank You to Mikek314 For This Useful Post:

    Alec in France (08-03-2013),blackvoid (08-02-2013),DaltonSkyGazer (08-02-2013),j.gardavsky (08-03-2013),jimminCT (08-02-2013),johnrfeeney (08-02-2013),Makuser (08-02-2013)

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    Default Re: Simeis 57, the Propellor Nebula

    that was a great lesson and fantastic image - thank you

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    Default Re: Simeis 57, the Propellor Nebula

    Simply incredible. I'll be studying this image for a while. Thank you for sharing.

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    Default Re: Simeis 57, the Propellor Nebula

    Mike,

    Nice image and write-up. I was just looking up all of the same information because I had noticed that someone else had posted an image of this to another site. I had to also download the image and plate-solve it to find the location. I might shoot it sometime soon.

    Thanks for posting,

    Dan
    Dan Crowson - O'Fallon MO

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    Default Re: Simeis 57, the Propellor Nebula

    Dan,

    You remind me that I should have given the coordinates of the object. The center of my image is at approximately RA=20:16:00 and Dec= +43:40:00.
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    Default Re: Simeis 57, the Propellor Nebula

    Both the image and the research are pleasing!

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    Default Re: Simeis 57, the Propellor Nebula

    Hello Mike. I'm still not sure what to make of all the nomenclature, but your image is beautiful. Very pretty delicate nebulosity color and a large field of sparkly stars. Thanks for sharing this seldom seen image with us, and best of regards.
    - Marshall
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    Default Re: Simeis 57, the Propellor Nebula

    This is truly an enlightening forum as i have never even heard of the propellor nebula before now. Great image thanks.
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    Default Re: Simeis 57, the Propellor Nebula

    Odd story that will surely pass through my mind, but I really enjoyed your photo!
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    Default Re: Simeis 57, the Propellor Nebula

    Great read, and a great image Mike. Thanks for both.

    Regards,

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