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Image of the day 07/05/2019

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    Pickering's Triangle (NGC 6979), 





    
        

            Gary Lopez
    Pickering's Triangle (NGC 6979)

    Pickering's Triangle (NGC 6979)

    Technical card

    Resolution: 3289x2193

    Dates:June 22, 2019June 23, 2019June 25, 2019June 26, 2019June 27, 2019June 28, 2019

    Frames:
    Astrodon B Gen 2 E-series 31mm: 19x60" (gain: 200.00) -15C bin 1x1
    Astrodon G Gen 2 E-series 31mm: 18x60" (gain: 200.00) -15C bin 1x1
    Astrodon Ha 3nm-31mm: 51x300" (gain: 200.00) -15C bin 1x1
    Astrodon OIII 3nm-31mm: 58x300" (gain: 200.00) -15C bin 1x1
    Astrodon R Gen 2 E-series 31mm: 18x60" (gain: 200.00) -15C bin 1x1
    Astrodon SII 3nm-31mm: 18x300" (gain: 200.00) -15C bin 1x1

    Integration: 11.5 hours

    Darks: ~30

    Bias: ~50

    Avg. Moon age: 22.41 days

    Avg. Moon phase: 47.29%

    Bortle Dark-Sky Scale: 5.00

    Astrometry.net job: 2779738

    RA center: 312.021 degrees

    DEC center: 31.663 degrees

    Pixel scale: 0.864 arcsec/pixel

    Orientation: 85.700 degrees

    Field radius: 0.474 degrees

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

    Data source: Backyard

    Description

    In the constellation Cygnus is a chaotic lace-work of glowing filaments, remnants of a super nova explosion whose light reached Earth about 5,000 years ago. It is called Pickering's Triangle, named for Charles Pickering, the director of Harvard College Observatory, cataloged NGC 6979, and part of the Veil Nebula complex. It has been argued that this object should really be called Flemming's Triangular Wisp since it was identified by Pickering's assistant, Williamina Flemming. She is credited with discovering 10 novae, over 310 variable stars, and 59 gaseous nebulae (citation Steve Cannista, Universe Today).

    After three months of cloudy nights, the sky began peeking through last week, an hour or two at a time. The seeing was inconsistent which meant that while I collected more than 20 hours of data for this project, I used only 11.5 hours, light subs with HFR <2.5. I reduced that number again in the creation of a master luminance (comprised of Ha, OIII, and SII), using only subs with an HFR <2.0. All in all, it was worth the effort as the resulting image has nice detail and shows both the characteristic ribbons of glowing Ha and OIII, as well as faint diaphanous sheets of gas and dust.

    Comments

    Author

    GWLopez
    Gary Lopez
    License: None (All rights reserved)
    166128
    Like

    Revisions

      Pickering's Triangle (NGC 6979), 





    
        

            Gary Lopez
      Original
    • Final
      Pickering's Triangle (NGC 6979), 





    
        

            Gary Lopez
      B
      Pickering's Triangle (NGC 6979), 





    
        

            Gary Lopez
      C

    B

    Reprocessed to eliminate a bit of stubborn noise, especially in the star field.

    C

    Version with a different approach to noise reduction in an effort to retain a bit more fine structure, especially in the diaphanous sheet of gas and dust.

    Sky plot

    Sky plot

    Histogram

    Pickering's Triangle (NGC 6979), 





    
        

            Gary Lopez