Hemisphere:  Northern  ·  Contains:  68 A Cyg  ·  NGC7044  ·  PK087-03.1  ·  Sh2-119  ·  The star 68Cyg
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Sh2-119 Narrowband Natural, 


            Gary Lopez
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Sh2-119 Narrowband Natural

Imaging telescopes or lenses: William Optics GT71 71mm f/5.9 Apo Refractor

Imaging cameras: ZWO ASI1600MM Cooled PRO

Mounts: Orion Atlas EQ-G

Guiding telescopes or lenses: Orion 50mm Guide Scope with helical focusing

Guiding cameras: Lacerta M-Gen II Autoguider

Focal reducers: William Optics 0.8X Field Flattener

Software: Adobe Lightroom CC  ·  Photoshop CC  ·  Main Sequence Software Sequence Generator Pro, v3.0  ·  Pleaides PixInsight Core 1.8

Filters: Astrodon OIII 3nm-31mm  ·  Astrodon SII 3nm-31mm  ·  Astrodon Ha 3nm-31mm

Dates:Aug. 12, 2019Aug. 13, 2019Aug. 14, 2019Aug. 15, 2019

Astrodon Ha 3nm-31mm: 280x180" (gain: 139.00) -15C bin 1x1
Astrodon OIII 3nm-31mm: 79x180" (gain: 139.00) -15C bin 1x1
Astrodon SII 3nm-31mm: 120x180" (gain: 139.00) -15C bin 1x1

Integration: 23.9 hours

Darks: ~35

Bias: ~45

Avg. Moon age: 13.39 days

Avg. Moon phase: 96.75%

Bortle Dark-Sky Scale: 4.00

Astrometry.net job: 2873992

RA center: 21h 18' 22"

DEC center: +43° 45' 42"

Pixel scale: 2.303 arcsec/pixel

Orientation: -88.835 degrees

Field radius: 1.764 degrees

Resolution: 4398x3325

Locations: Monterey Pines Observatory, Monterey, California, United States

Data source: Backyard


This is a wide-angle view of Sharpless 119 (Sh2-119), a large emission nebula covering about three degrees of the sky in the constellation Cygnus. My previous posting of Sh2-119 focused on the Bok globules and dark dust lanes of the object using a traditional HST palette (https://www.astrobin.com/421855/?nc=user). In this rendition, I am showing the entire nebula using much of the same narrowband data, but here with a combination of the three channels that yields a more “natural” color representation. Since the OIII data for this project were very poor, the perimeter of most frames blown out by light from the full Moon, I mixed the much stronger SII data with the OIII to retain structure in both the green and blue channels. After a fair amount of trial and error in PI Pixel Math, I was able to salvage a reasonable image if Sh2-119.

Van McComas astutely observed that the structure of this nebula, with the very light OIII signal in the core, gives the appearance of looking through a window at the cosmos beyond. So, since this object does not have a common name, how about we call it Window Nebula?



Gary Lopez
License: None (All rights reserved)

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Sh2-119 Narrowband Natural, 


            Gary Lopez