Hemisphere:  Northern  ·  Constellation: Cygnus (Cyg)
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NGC 6974: Pickering's (and Fleming's!) Triangle, 



    
        

            Glenn Diekmann
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NGC 6974: Pickering's (and Fleming's!) Triangle

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NGC 6974: Pickering's (and Fleming's!) Triangle, 



    
        

            Glenn Diekmann
Powered byPixInsight

NGC 6974: Pickering's (and Fleming's!) Triangle

Imaging Telescopes Or Lenses
Sky-Watcher Quattro 250P
Imaging Cameras
ZWO ASI294MM Pro
Mounts
Astro-Physics Mach1 GTO CP4
Filters
Astrodon Ha 5 nm · Astrodon Blue Tru-Balance E-Series Gen 2 · Astrodon Green Tru-Balance E-Series Gen 2 · Astrodon Red Tru-Balance E-Series Gen 2 · Astrodon OIII 5 nm
Accessories
Tele Vue Paracorr Type 2
Software
PixInsight 1.8 · Adobe Lightroom Classic CC · PHD2 · Starkeeper Software Voyager
Guiding Telescopes Or Lenses
Sky-Watcher Quattro 250P
Guiding Cameras
ZWO ASI174MM Mini

Acquisition details

Dates:
Aug. 13, 2021 ·  Aug. 16, 2021
Frames:
Astrodon Blue Tru-Balance E-Series Gen 2: 31x90" (46' 30") (gain: 0.00) -10C bin 2x2
Astrodon Green Tru-Balance E-Series Gen 2: 32x90" (48') (gain: 0.00) -10C bin 2x2
Astrodon Ha 5 nm: 151x240" (10h 4') (gain: 120.00) -10C bin 2x2
Astrodon OIII 5 nm: 160x180" (8h) (gain: 120.00) -10C bin 2x2
Astrodon Red Tru-Balance E-Series Gen 2: 33x90" (49' 30") (gain: 0.00) -10C bin 2x2
Integration:
20h 28'
Darks:
50
Flats:
20
Bias:
200
Avg. Moon age:
6.70 days
Avg. Moon phase:
43.19%
Bortle Dark-Sky Scale:
7.00

RA center: 20h48m17s.847

DEC center: +31°3227.42

Pixel scale: 0.833 arcsec/pixel

Orientation: -91.956 degrees

Field radius: 0.545 degrees

More info:Open 

Resolution: 3949x2569

Data source: Backyard

Description

Pickering's Triangle, also known by the designation NGC 6974, is part of a large supernova remnant in Cygnus. The larger structure, variously called the Veil Nebula or the Cygnus loop, spans about six full moons and was discovered visually by William Herschel on September 5, 1784. The first photograph of the triangle was taken by Williamina Fleming, a Scottish astronomer working with Edward Charles Pickering in the United States, in 1904. However, credit for the discovery went to Pickering, who was the director of the observatory. 

Recent measurements suggest the distance of the nebula is about 2400 light-years. The supernova is thought to have been caused by a star 20 times more massive than the sun that exploded 10,000 to 20,000 years ago.

Comments

Revisions

  • NGC 6974: Pickering's (and Fleming's!) Triangle, 



    
        

            Glenn Diekmann
    Original
  • Final
    NGC 6974: Pickering's (and Fleming's!) Triangle, 



    
        

            Glenn Diekmann
    B

B

Description: Contrast and saturation adjustments.

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NGC 6974: Pickering's (and Fleming's!) Triangle, 



    
        

            Glenn Diekmann