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I agreeImaging telescope or lens:William Optics GT71 71mm f/5.9 Apo Refractor
Imaging camera:ZWO ASI1600MM Cooled PRO
Mount:Orion Atlas EQ-G
Guiding telescope or lens:Orion 50mm Guide Scope with helical focusing
Guiding camera:Lacerta M-Gen II Autoguider
Focal reducer: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
Resolution: 4398x3325
Dates:Aug. 12, 2019, Aug. 13, 2019, Aug. 14, 2019, Aug. 15, 2019
Frames:
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' 43"
Pixel scale: 2.303 arcsec/pixel
Orientation: 88.993 degrees
Field radius: 1.764
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.
UPDATE
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?
| SF Bay Area Imagers |
| Suburban Astrophotography |
| ZWO ASI1600MM/QHY163M |
| Sharpless2 Objects |
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