Hemisphere:  Northern  ·  Constellation: Cygnus (Cyg)  ·  Contains:  12 phi Cyg  ·  9 Cyg  ·  Sh2-91  ·  The star 9Cyg  ·  The star φCyg
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Sh2-91, 



    
        

            Gary Imm
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Sh2-91

Getting plate-solving status, please wait...
Sh2-91, 



    
        

            Gary Imm
Powered byPixInsight

Sh2-91

Imaging telescopes or lenses: Takahashi FSQ-85ED

Imaging cameras: ZWO ASI 1600MM Cooled Pro

Mounts: Astro-Physics Mach1GTO

Guiding telescopes or lenses: Orion 60mm Guidescope

Guiding cameras: Orion StarShoot AutoGuider Pro Mono

Software: Main Sequence Software Sequence Generator Pro  ·  PixInsight  ·  Stark Labs PHD2 2.6.3

Filters: Astrodon Ha 31mm 5nm  ·  Astrodon OIII 31mm 3nm  ·  Astrodon Green 31mm Gen2 I-Series  ·  Astrodon Blue 31mm Gen2 I-Series  ·  Astrodon Red 31mm Gen2 I-Series

Accessory: ZWO EFW  ·  Takahashi Flattener TOA-67  ·  Feathertouch Focuser Boss II Electronic Focusing Control


Dates:July 28, 2019July 29, 2019

Frames:
Astrodon Blue 31mm Gen2 I-Series: 60x60" (1h) (gain: 139.00) -15C bin 1x1
Astrodon Green 31mm Gen2 I-Series: 60x60" (1h) (gain: 139.00) -15C bin 1x1
Astrodon Ha 31mm 5nm: 24x300" (2h) (gain: 300.00) -15C bin 1x1
Astrodon OIII 31mm 3nm: 24x300" (2h) (gain: 300.00) -15C bin 1x1
Astrodon Red 31mm Gen2 I-Series: 60x60" (1h) (gain: 139.00) -15C bin 1x1

Integration: 7h

Avg. Moon age: 26.05 days

Avg. Moon phase: 13.32%


Astrometry.net job: 2860005

RA center: 19h 36' 4"

DEC center: +29° 34' 19"

Pixel scale: 1.739 arcsec/pixel

Orientation: -9.584 degrees

Field radius: 1.381 degrees


Resolution: 4579x3422

Locations: Backyard (Mag 20.8 - Bortle 4.5), Onalaska, Texas, United States

Data source: Backyard

Description

This object, discovered in 1977, is comprised of filaments from the supernova remnant SNR 065.2+05.7. It is located 2500 light years away in the constellation of Cygnus. Overshadowed by the magnificent Veil Nebula (Cygnus Loop) SNR in the same constellation, this object is much more faint but still beautiful as it stands silhouetted against the dense starry background.

This SNR is huge, covering an area of 16 square degrees. This image only captures a small portion of it - other portions include Sh2-94 and Sh2-96. Because it is so large, with a diameter of 230 light years, it is very faint compared to the Veil Nebula. It is also very old - age estimates range from 20,000 to 400,000 years. The large age range is because there may be multiple supernova remnants overlapping in this area.

I have attached an image from a 2002 paper by Mavromatakis et al which shows the field of view of this image as compared to the entire SNR. The subject of this image is identified by numbers 2, 8 and 3.

Out of respect for this wonderful object, I refuse to call it the "Little Veil" as some do. Besides, the Veil Nebula is only 100 light years in diameter compared to this object's 230 light year diameter, so if anything this object should really be called the "Big Veil".

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