Hemisphere:  Northern  ·  Constellation: Cygnus (Cyg)
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Pickering Triangle/Flemming’s Triangular Wisp (NGC 6979), 


            Gary Lopez
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Pickering Triangle/Flemming’s Triangular Wisp (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 telescopes or lenses: Orion 50mm Guide Scope with helical focusing

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 2x2
Astrodon G Gen 2 E-series 31mm: 18x60" (gain: 200.00) -15C bin 2x2
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 2x2
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

Astrometry.net job: 3808995

RA center: 20h 48' 5"

DEC center: +31° 39' 23"

Pixel scale: 0.863 arcsec/pixel

Orientation: -92.685 degrees

Field radius: 0.492 degrees

Resolution: 3281x2461

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

Data source: Backyard


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).

This is an SHO/RGB rendition of data collected in 2019 (Yes, the sky here in Monterey, CA is still blanketed by coastal fog and wildfire smoke). I originally published an HOO/RGB version of these data. The sky conditions were wildly inconsistent during the period the data were acquired and while more than 20 hours were collected, I used only 11.5 hours of sub lights in this image, subs with HFR <2.5. For this SHO/RGB rendition I created a master luminance using the Ha and OIII data sub with HFR <2.0. I quieted the noise and accentuated structural details in the master luminance using successive rounds of low-iteration Multiscale Median Transform and Deconvolution.