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Simeis 57 (DWB-111 & DWB-119) The Propeller Nebula (in SHO), Roland Schliessus
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Simeis 57 (DWB-111 & DWB-119) The Propeller Nebula (in SHO)

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Simeis 57 (DWB-111 & DWB-119) The Propeller Nebula (in SHO), Roland Schliessus
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Simeis 57 (DWB-111 & DWB-119) The Propeller Nebula (in SHO)

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Description

The propeller nebula Simeis 57 (DWB-111 & DWB-119) was cataloged in the 1950s by astronomers from the Simeiz Observatory (Ukraine) as the 57th object in a catalog with 306 HII regions.

The Propeller Nebula is often incorrectly referred to as DWB 111, however, DWB 111 identifies the southern arm of the Propeller, while the northern one is DWB 119. The DWB catalog of 109 emission nebulae associated with the Cygnus X star-forming region was published by the three astronomers H. R. Dickel, H. Wendker and J. H. Bieritz in 1969.

The Propeller Nebula is near Gamma Cygni to the northeast. Like many emission nebulae in Cygnus, the Propeller is part of the giant Cygnus X molecular cloud, about 4600 light-years from the solar system. Between it and us, at a distance of about 300 light-years, is another, much closer, dark molecular cloud called the Cygnus Rift, which makes observing them much more difficult. Cygnus Rift can be observed with the naked eye under dark skies: it is the dark streak dividing the Milky Way in two, stretching from Cygnus to Sagittarius. The massive amount of dust and plasma that Cygnus Rift contains absorbs most of the light coming from stars and other objects behind it.

Unfortunately, we know very little about the Propeller Nebula, even its distance is still undetermined. It emits primarily on the hydrogen alpha line, while being much dimmer at other wavelengths. The stars or other sources responsible for ionizing the gas have yet to be identified. The mass of the cloud is estimated to be less than 50 solar masses.

==================== Source: astro.i-net.hu ==============================

Datum:
    16. Juni 2021 ·  18. Juni 2021
Frames:
    Baader Blue (B-CCD) 1.25": 12×180″(36′) (gain: 139.00) -20°C bin 1×1
    Baader Blue (B-CCD) 1.25": 12×5″(1′) (gain: 139.00) -20°C bin 1×1
    Baader Green (G-CCD) 1.25": 12×180″(36′) (gain: 139.00) -20°C bin 1×1
    Baader Green (G-CCD) 1.25": 12×5″(1′) (gain: 139.00) -20°C bin 1×1
    Baader Red (R-CCD) 1.25": 12×180″(36′) (gain: 139.00) -20°C bin 1×1
    Baader Red (R-CCD) 1.25": 12×5″(1′) (gain: 139.00) -20°C bin 1×1

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Simeis 57 (DWB-111 & DWB-119) The Propeller Nebula (in SHO), Roland Schliessus