Sharpless 2-104

Posted by dcrowson
on Monday, October 22, 2018

Sharpless 104 (LBN 195, DWB 14 ( and others) is a bright, circular emission nebula approximately 13,000 light-years away in Cygnus. The stars ‘in’ the nebula are cataloged as open cluster Dolidze 4.

AGN20.18.3 (DWB 18 and others) is the bright nebula at the left (east) center of the image.

DWB 16 is the nebula below and to the left (east) of AGN20.18.3 / DWB 18.

The largest open cluster is IC 4996 near the top center. Other open clusters include Berkeley 85 to the left of IC 4996, Berkeley 87 further east and Dolidze 3 near the bottom right.

This area is just to the west of the Northern Coalsack or Cygnus Rift.

Ha – 24x1800s – 720 minutes – binned 1x1
RGB – 8x300s – 40 minutes each – binned 2x2

840 minutes total exposure – 14 hours

Imaged from Dardenne Prairie, Missouri (a red zone) on August 26th, 27th and 28th and September 3rd, 2018 with a SBIG ST-8300M on an Astro-Tech AT90DT at f/6.7 603mm.


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