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Image of the day 07/05/2019

Getting plate-solving status, please wait...
    Pickering's Triangle (NGC 6979), 


            Gary Lopez
    Powered byPixInsight

    Pickering's Triangle (NGC 6979)

    Imaging telescopes or lenses: William Optics FLT 132 Triplet APO f/7

    Imaging cameras: ZWO ASI1600MM Cooled PRO

    Mounts: Orion Atlas EQ-G

    Guiding cameras: Lacerta M-Gen II Autoguider

    Focal reducers: William Optics Flattener 68III

    Software: Adobe Lightroom CC  ·  Photoshop CC  ·  Main Sequence Software Sequence Generator Pro, v3.0  ·  Pleaides PixInsight Core 1.8

    Filters: Astrodon R Gen 2 E-series 31mm  ·  Astrodon G Gen 2 E-series 31mm  ·  Astrodon B Gen 2 E-series 31mm  ·  Astrodon OIII 3nm-31mm  ·  Astrodon SII 3nm-31mm  ·  Astrodon Ha 3nm-31mm

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

    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: 4.00 job: 2779738

    RA center: 20h 48' 4"

    DEC center: +31° 39' 46"

    Pixel scale: 0.863 arcsec/pixel

    Orientation: -85.738 degrees

    Field radius: 0.474 degrees

    Resolution: 3289x2193

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

    Data source: Backyard


    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.



    Gary Lopez
    License: None (All rights reserved)

    Sky plot

    Sky plot


    Pickering's Triangle (NGC 6979), 


            Gary Lopez