Hemisphere:  Northern  ·  Contains:  IC 443  ·  The star Propus (ηGem)

Image of the day 04/25/2018

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    IC 443 Supernova Remnant (Jellyfish Nebula) in Gemini, 


            Mike Oates
    IC 443 Supernova Remnant (Jellyfish Nebula) in Gemini
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    IC 443 Supernova Remnant (Jellyfish Nebula) in Gemini

    Technical card

    Imaging telescopes or lenses: Takahashi FSQ-106 ED

    Imaging cameras: Starlight Xpress SX-814 Trius Monochrome CCD

    Mounts: Sky-Watcher EZ-EQ6 GT

    Guiding cameras: Starlight-XPress Lodestar Autoguider

    Software: Sequence Generator Pro  ·  Photoshop CS6  ·  PIXINSIGHT 1.8

    Filters: Astrodon 3nm SII  ·  Astrodon 3nm OIII  ·  Ha 3nm  ·  Red  ·  Green  ·  Blue

    Accessory: Lakeside Astro Motor Focus System  ·  Starlight Xpress SX 'Maxi wheel'  ·  Starlight Instruments FTF3545B-A Focuser

    Dates:March 20, 2018

    Astrodon 3nm OIII: 26x1800" bin 1x1
    Astrodon 3nm SII: 1x1800" bin 1x1
    Astrodon 3nm SII: 10x600" bin 2x2
    Blue: 20x15" bin 2x2
    Green: 20x15" bin 2x2
    Ha 3nm: 12x1800" bin 1x1
    Ha 3nm: 8x600" bin 2x2
    Red: 20x15" bin 2x2

    Integration: 22.8 hours

    Avg. Moon age: 2.99 days

    Avg. Moon phase: 9.76%

    Basic astrometry details

    Astrometry.net job: 2013058

    RA center: 6h 16' 25"

    DEC center: +22° 29' 34"

    Pixel scale: 1.437 arcsec/pixel

    Orientation: 0.054 degrees

    Field radius: 0.863 degrees

    Resolution: 3310x2778

    Locations: The Hills Observatory, Manchester, United Kingdom

    Data source: Backyard


    Here is my narrowband image of the Jellyfish Nebula with RGB stars.

    My aim with this image was to show more of the OIII component and to that end more than half of the integration time was devoted to OIII capture.

    The NB images were processed using the tone mapping technique where all the stars are removed, the data is then processed to enhance detail etc and the stars are added back from the RGB data. All calibration and most of the processing was done in PixInsight and star removal and final assembly of the image is performed in Photoshop.

    The colours are mapped as follows:

    Ha = Red
    OIII = Blue
    SII = Yellow

    Using these colours you can clearly see that the redder nebula in the top left corner (part of the IC444 nebula) is quite different from the more orange colour of the SN remnant. The orange coming from the mix of Ha and SII, there being very little SII in the IC444 nebula visible in this image.

    All the NB filters are Astrodon 3nm filters.

    I also have a wider field of this nebula in Ha



    Mike Oates
    License: None (All rights reserved)

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    IC 443 Supernova Remnant (Jellyfish Nebula) in Gemini, 


            Mike Oates