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Contains:  Helix nebula, NGC 7293

Image of the day 08/20/2018

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    Helix Nebula NGC7293, 


            Kevin Morefield
    Helix Nebula NGC7293

    Helix Nebula NGC7293

    Technical card

    Imaging telescope or lens:Planewave CDK14

    Imaging camera:SBIG STX 16803

    Mount:Paramount ME II

    Guiding telescope or lens:Planewave CDK14

    Software:Adobe Photoship CCCCDWare CCDAutoPilot 5CCDWare CCDStack 2

    Filters:Astrodon OIII 3 nmAstrodon Ha 5 nm

    Resolution: 3726x3266

    Dates:Aug. 15, 2018

    Frames: 76x1365"

    Integration: 28.8 hours

    Avg. Moon age: 4.57 days

    Avg. Moon phase: 21.87% job: 2204461

    RA center: 337.428 degrees

    DEC center: -20.837 degrees

    Pixel scale: 0.728 arcsec/pixel

    Orientation: 350.317 degrees

    Field radius: 0.501 degrees

    Locations: Sierra Remote Observatory, Auberry, California, United States

    Data source: Own remote observatory

    Remote source: Sierra Remote Observatories


    The Helix Nebula! This is one of the closest "Planetary" nebula at 700 light years and surely one of the largest. The age is estimated at 10,000 years and was a star similar to our Sun.

    I tried this many times but could not get a decent guide star with my STI based, 640x480 guide camera. I replaced that with a QHY174 at 1920x1080 and a MMOAG and now I have guide stars!

    I used at total of 28.83 hours of Ha and OIII data for this. The central highlights are 20 minutes 1x1 subs and the dimmer parts also include 30 minute 2x2 subs. Unfortunately the smoke from nearby fires in Yosemite park limited what I could capture on the most extended parts of the nebula. I guess that gives me something to look forward to improving next year.

    The Core is a bi-color of Ha for Red, OIII for Blue, and an OIII heavy mix for Green. The rest is an HOO blend. I chose those mixes to get a more appropriate red color for the extended Ha nebulosity and to get the maximum separation of detail in the core.



    Kevin Morefield
    License: None (All rights reserved)


      Helix Nebula NGC7293, 


            Kevin Morefield
    • Final
      Helix Nebula NGC7293, 


            Kevin Morefield


    Re-worked the highlight colors

    Sky plot

    Sky plot


    Helix Nebula NGC7293, 


            Kevin Morefield