Hemisphere:  Northern  ·  Constellation: Delphinus (Del)

Image of the day 09/06/2020

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    Abell 72 (PK 59 -18.1) Planetary Nebula in Delphinus, 


            Douglas J Struble
    Abell 72 (PK 59 -18.1) Planetary Nebula in Delphinus
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    Abell 72 (PK 59 -18.1) Planetary Nebula in Delphinus

    Technical card

    Imaging telescopes or lenses: Explore Scientific ED165CF FPL-53

    Imaging cameras: ZWO ASI1600MM-PRO

    Mounts: Astro-Physics Mach 1 GTO

    Guiding telescopes or lenses: Orion 80mm Short Tube

    Guiding cameras: Starlight Xpress Lodestar x2

    Software: Adobe Photoshop CS5.5  ·  PHD2  ·  Sequence Generator Pro  ·  PixInsight  ·  SkySafari Pro

    Filters: Astronomik Deep-Sky B  ·  Astronomik Deep-Sky G  ·  Astronomik Deep-Sky R  ·  Astrodon OIII 3nm

    Accessory: ZWO 8x 1.25" Filter Wheel (EFW)  ·  QHYCCD PoleMaster  ·  Hotech 2" SCA Self-Centering Field Flattener  ·  MoonLite CFL 2.5" Large Format Focuser

    Dates:Aug. 17, 2020Aug. 22, 2020Aug. 23, 2020

    Astrodon OIII 3nm: 506x120" (gain: 200.00) -20C bin 1x1
    Astronomik Deep-Sky B: 31x60" (gain: 0.00) -20C bin 1x1
    Astronomik Deep-Sky G: 30x60" (gain: 0.00) -20C bin 1x1
    Astronomik Deep-Sky R: 43x60" (gain: 0.00) -20C

    Integration: 18.6 hours

    Darks: ~50

    Flats: ~50

    Bias: ~250

    Avg. Moon age: 12.18 days

    Avg. Moon phase: 14.75%

    Bortle Dark-Sky Scale: 8.00

    Basic astrometry details

    Astrometry.net job: 3799228

    RA center: 20h 50' 1"

    DEC center: +13° 33' 39"

    Pixel scale: 0.681 arcsec/pixel

    Orientation: 281.869 degrees

    Field radius: 0.155 degrees

    Resolution: 1282x1028

    Locations: Backyard White Zone Observatory, Taylor, MI, Michigan, United States

    Data source: Backyard


    This was a major challenge for me at 0.68"/pixel with my ES 165 at only 2 arc minutes. My inspiration for this was shot with a 80cm f/7 AstroOptik Keller corrected cassegrain in Chili:


    This faint planetary nebula, Abell 72 (PK 059+18.1) in the constellation Delphinus, is an expanding glowing shell of ionized gas ejected from an old red giant star. The beautiful object of George O. Abell's Catalog of Planetary Nebula is 5'700 ± 1150 light years from earth and about 2 light years across.


    Sky plot

    Sky plot


    Abell 72 (PK 59 -18.1) Planetary Nebula in Delphinus, 


            Douglas J Struble