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Contains:  The star φCyg, The star 9Cyg
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Sh2-91, 





    
        

            Gary Imm
Sh2-91

Sh2-91

Technical card

Resolution: 4579x3422

Dates:July 28, 2019July 29, 2019

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

Integration: 7.0 hours

Avg. Moon age: 26.05 days

Avg. Moon phase: 13.32%

Astrometry.net job: 2860005

RA center: 294.019 degrees

DEC center: 29.575 degrees

Pixel scale: 1.739 arcsec/pixel

Orientation: 9.370 degrees

Field radius: 1.381 degrees

Locations: Backyard (Mag 20.8 - New Moon), 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".

Comments

Author

GaryI
Gary Imm
License: None (All rights reserved)
2298
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Revisions

  • Final
    Sh2-91, 





    
        

            Gary Imm
    Original
  • Sh2-91, 





    
        

            Gary Imm
    B

B

SNR Map

Sky plot

Sky plot

Histogram

Sh2-91, 





    
        

            Gary Imm