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Image of the day 09/08/2020

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    Cygnus Loop | The Whole Ear - Lobe and All, 


            Kevin Morefield
    Powered byPixInsight

    Cygnus Loop | The Whole Ear - Lobe and All

    Imaging telescopes or lenses: Takahashi FSQ 106 EDX4

    Imaging cameras: QHYCCD QHY600M

    Mounts: Paramount MyT

    Guiding telescopes or lenses: Takahashi FSQ 106 EDX4

    Guiding cameras: Starlight Express UltraStar Mono

    Software: CCDWare CCDStack 2  ·  CCDWare CCDAutoPilot 5  ·  Adobe Photoship CC  ·  PixInsight

    Filters: Chroma Ha 5nm  ·  Chroma OIII 3nm  ·  Chroma SII 5nm

    Dates:Aug. 27, 2020

    Chroma Ha 5nm: 74x600" (gain: 56.00) -10C bin 1x1
    Chroma OIII 3nm: 48x600" (gain: 56.00) -10C bin 1x1
    Chroma SII 5nm: 40x600" (gain: 56.00) -10C bin 1x1

    Integration: 27.0 hours

    Darks: ~9

    Flats: ~12

    Avg. Moon age: 9.20 days

    Avg. Moon phase: 68.84%

    Bortle Dark-Sky Scale: 7.00

    Astrometry.net job: 3816961

    RA center: 20h 51' 37"

    DEC center: +30° 32' 7"

    Pixel scale: 1.459 arcsec/pixel

    Orientation: 77.619 degrees

    Field radius: 2.878 degrees

    Resolution: 11260x8664

    Locations: Central Portland Oregon, Portland, Oregon, United States

    Data source: Backyard


    I've been wanting to try capturing the entire Cygnus Loop and I thought I'd have it with the QHY600M and FSQ106. Nope - just didn't fit. So this is a two panel mosaic shot from the backyard over much of August.

    To me this looks like and ear with oriented 90 degrees counter-clockwise to how I have it here.

    My Chroma filters really did the trick because I live in the city, 3 miles from downtown Portland. Ha 5nm, OIII and SII 3nm works.

    I wasn't sure what color combo to use. This looks great in HOO, probably the closest to the broadband appearance narrowband ever gets. But the SII is very strong and I wanted to use it because it represents different structures than the Ha. The outer shell that makes the delicate wispy magentas here is completely missing in SII for example.

    So this is what I settled on:

    Luminance = HaOIII 50/50
    Red = Ha
    Green = OIII
    Blue = Ha+OIII-SII

    So the SII removes most of the red structures the Ha brings and that helps purify the blues by contrasting them better with the Red. In any case this gave me a lot of different colors to work with. Maybe too much for some? At least each of the different colors does represent a different combination of emission/reflection in that part of the object.

    Processing steps:

    1) Calibration with CCDStack
    2) Star Alignment to a Mosaic master in PI
    3) Image integration for channel masters in PI
    4) Color combination into panel masters in CCDStack (I like the normalization and NB combine)
    5) DBE on the panel masters in PI
    6) Stitch of the panel masters in APP
    7) Starless version created in Starnet++
    8) Noise Reduction on the starless in Topaz De-noise AI
    9) Color, curves, clean-up, and stars returned in Photoshop CC