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

Image of the day 04/25/2018

Getting plate-solving status, please wait...
    IC 443 Supernova Remnant (Jellyfish Nebula) in Gemini, 



    
        

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

    IC 443 Supernova Remnant (Jellyfish Nebula) in Gemini

    Image of the day 04/25/2018

    Getting plate-solving status, please wait...
      IC 443 Supernova Remnant (Jellyfish Nebula) in Gemini, 



    
        

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

      IC 443 Supernova Remnant (Jellyfish Nebula) in Gemini

      Equipment

      Imaging Telescopes Or Lenses
      Takahashi FSQ-106 ED
      Imaging Cameras
      Starlight Xpress SX-814 Trius Monochrome CCD
      Mounts
      Sky-Watcher EZ-EQ6 GT
      Filters
      Astrodon 3nm OIII · Astrodon 3nm SII · Ha 3nm · Red · Green · Blue
      Accessories
      Lakeside Astro Motor Focus System · Starlight Xpress SX 'Maxi wheel' · Starlight Instruments FTF3545B-A Focuser
      Software
      Sequence Generator Pro · Photoshop CS6 · PIXINSIGHT 1.8
      Guiding Cameras
      Starlight-XPress Lodestar Autoguider

      Acquisition details

      Dates:
      March 20, 2018
      Frames:
      Astrodon 3nm OIII: 26x1800" (13h) bin 1x1
      Astrodon 3nm SII: 1x1800" (30') bin 1x1
      Astrodon 3nm SII: 10x600" (1h 40') bin 2x2
      Blue: 20x15" (5') bin 2x2
      Green: 20x15" (5') bin 2x2
      Ha 3nm: 12x1800" (6h) bin 1x1
      Ha 3nm: 8x600" (1h 20') bin 2x2
      Red: 20x15" (5') bin 2x2
      Integration:
      22h 45'
      Avg. Moon age:
      2.99 days
      Avg. Moon phase:
      9.76%

      Basic astrometry details

      Astrometry.net job: 2013058

      RA center: 06h16m25s.2

      DEC center: +22°2934

      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

      Description

      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

      Comments

      Sky plot

      Sky plot

      Histogram

      IC 443 Supernova Remnant (Jellyfish Nebula) in Gemini, 



    
        

            Mike Oates