a HII Region in Cygnus - DWB 191 - 193, LBN 380 and others

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

The starless Halpha-image:

Click on image for a zoomable version

Location / Date

Zellerndorf, August 2018

Telescope / Mount / Guiding

ASA 10" Astrograph, ASA 3" Wynne-Corrector (focal length 910mm)
ASA DDM60, no Guiding

Camera / Exposure

Moravian G3-16200, Astrodon filters

2-panel mosaic:

R         2 x (18 x 10min)
G        2 x (18 x 10min)
B        2 x (18 x 10min)
Hα       2 x (10 x 40min)

Total exposure time: 31h 20min


PixInsight, Fitswork, Photoshop


This H II region is part of the western Cygnus X complex.

Three emission nebulas are listes in the DWB-Catalogue ("A list of optically visible HII regions" by Dickel, Wendker and Bieritz, 1969): DWB 191, DWB 192 and DWB 193.

Several emission nebulas are listed in the Lynds' Catalogue of Bright Nebulae (LBN). This catalogue is not very accurate in this area, the coordinates does not point to the brightest nebula parts but in between. In the annotated image I have tried to correct this as it seems right to me.

Sh2-116,also known as Abell 71 is a small, round shaped nebula. Abell 71 has a really weird history. First it was catalogued in 1955 by G.O. Abell as a planetary nebula and then someone decided it was an emission nebula but then people have realised it is actually an old, but true PN. Here is another image of Sh2-116.

We 1-10 (PN G086.1+05.4) is a very faint Planetary Nebula, discoverd by R. Weinberger in 1977.
Near We 1-10 we find the reflection nebula vdB 134.

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