Sh2-112, 115, 116

Image information:

Date: 08/27/2020
Equipment: QSI583wsg with internal filter wheel using 5nm Astrodon Ha filter and Astrodon E series Gen II RGB filter set through Pentax-M* 67 300mm F/4 ED (IF) lens on Losmandy GM8 mount. The lens was working at f5.6.
Image type: HaRGB
Exposure time: 12X12min Ha binned 1X1, RG&B 12X8min each binned 1X1

Object information:

Object designations:

  • Sh2-112
  • Sh2-115
  • Sh2-116; Abell 71
  • Berkeley 90
Object type:
  • Sh2-112 - diffuse emission nebula
  • Sh2-115 - diffuse emission nebula
  • Sh2-116 - diffuse emission nebula / planetary nebula ?
  • Berkeley 90 - open cluster
Object size:
  • Sh2-112 - 15'
  • Sh2-115 - 50' X 30'
  • Sh2-116 - 2' X 2'
  • Berkeley 90 - 5'
Constellation: Cygnus

Sh2-112 and Sh2-115 are two emission nebulae in constellation of Cygnus. They are visible just northwest of Deneb, the brightest star in the constellation. Sh2-112 is 5760 ly distant and has diameter of 25 ly.

Glow of the gas in Sh2-115 is powered by hot stars in star cluster Berkeley 90, born from the material of the nebula. The star cluster is only 100 million years old, but solar winds of young stars in the cluster have already cleared much of the dust and gas in the surrounding cloud. Sh2-115 is 7500 ly distant and has diameter of some 110 ly.

Doubt about the true nature of Sh2-116 (Abell 71) is still present. It is possible that it is a very old planetery nebula, or just a round and dense emission nebula.

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