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Sh2-115 & Sh2-116 Feathers of the Swan in SHO, 


            Douglas J Struble
Sh2-115 & Sh2-116 Feathers of the Swan in SHO

Sh2-115 & Sh2-116 Feathers of the Swan in SHO

Technical card

Resolution: 3971x3176

Dates:June 27, 2017July 25, 2019July 31, 2019Aug. 2, 2019

Astrodon Ha 5nm: 123x240" (gain: 139.00) -20C bin 1x1
Astrodon OIII 3nm: 344x120" (gain: 200.00) -20C bin 1x1
Astrodon SII 3nm: 2x240" (gain: 139.00) -20C bin 1x1
Astronomik Ha 6nm 1.25'': 172x120" (gain: 200.00) -20C bin 1x1
Astronomik SII 1.25" 6nm: 204x120" (gain: 200.00) -20C bin 1x1

Integration: 32.3 hours

Darks: ~50

Flats: ~50

Bias: ~250

Avg. Moon age: 14.20 days

Avg. Moon phase: 16.19%

Bortle Dark-Sky Scale: 7.00 job: 2863603

RA center: 308.638 degrees

DEC center: 46.947 degrees

Pixel scale: 1.085 arcsec/pixel

Orientation: 263.723 degrees

Field radius: 0.766 degrees

Locations: Backyard Red Zone Observatory, Taylor, MI, Michigan, United States

Data source: Backyard


I worked on this image back in 2017 that was published in Sky & Telescope Magazine with my Stellarvue SV70T. I wanted to get in a bit closer to Sh2-115 and Sh2-116, so captured a bunch of new data with my SVX102T-R and then attempted to combine the two data sets together. I haven't had much of a problem in the past manually integrating two data sets, but got a lot of RANSAC errors this time around in PixInsight. Anyways, after fumbling around with some of the setting, I was abel to get some of the old 2017 data set to integrate with my new data set, but not all of it unfortunately.

Sh2-115 is a faint emission nebula cataloged by S.Sharpless in 1959. It is located in Cygnus, just 1 and 2 degrees northwest of Deneb, the brightest star of that constellation.

Sh2-116, or Abell 71, is the designation of the small round patch of emission nebulosity to the left of Sh2-115. It is also known as Sh2-116 and PK85+4.1. The latter being designated as a planetary nebula, but it has more recently been described as a small patch of emission nebula.



Douglas J Struble
License: None (All rights reserved)

Sky plot

Sky plot


Sh2-115 & Sh2-116 Feathers of the Swan in SHO, 


            Douglas J Struble