Hemisphere:  Northern  ·  Constellation: Gemini (Gem)  ·  Contains:  Sh2-274

Image of the day 06/25/2019

Getting plate-solving status, please wait...
    Abell 21 (SH2-274) - The Medusa Nebula (Bicolor), 



    
        

            Frank Breslawski
    Powered byPixInsight

    Abell 21 (SH2-274) - The Medusa Nebula (Bicolor)

    Image of the day 06/25/2019

    Getting plate-solving status, please wait...
      Abell 21 (SH2-274) - The Medusa Nebula (Bicolor), 



    
        

            Frank Breslawski
      Powered byPixInsight

      Abell 21 (SH2-274) - The Medusa Nebula (Bicolor)

      Equipment

      Imaging Telescopes Or Lenses
      Lacerta Newton ohne Namen 250/1200
      Imaging Cameras
      Astrel Instruments AST8300
      Mounts
      EQ8
      Filters
      Astronomik H-Alpha 6nm CCD · Astronomik OIII 6nm CCD
      Accessories
      GPU Pal Gyulai GPU 2" Aplanatic Coma Corrector
      Software
      PixInsight 1.8 · Zipproth GmbH Straton 2.0
      Guiding Cameras
      Lacerta MGEN2 with 9x50

      Acquisition details

      Dates:
      Feb. 24, 2019 ·  Feb. 25, 2019 ·  Feb. 26, 2019 ·  Feb. 27, 2019
      Frames:
      Astronomik H-Alpha 6nm CCD: 45x900" (11h 15') -20°C bin 1x1
      Astronomik OIII 6nm CCD: 36x900" (9h) -20°C bin 1x1
      Integration:
      20h 15'
      Darks:
      50
      Flats:
      10
      Bias:
      200
      Avg. Moon age:
      21.64 days
      Avg. Moon phase:
      55.22%
      Bortle Dark-Sky Scale:
      4.00

      RA center: 07h28m58s.380

      DEC center: +13°1938.60

      Pixel scale: 0.925 arcsec/pixel

      Orientation: 1.542 degrees

      Field radius: 0.424 degrees

      More info:Open 

      Resolution: 2307x2365

      Locations: Home, Bergisches Land, Germany

      Data source: Backyard

      Description

      Also known as Abell 21 and SH2-274, the Medusa Nebula is an old planetary nebula some 1500 light-years away in the constellation Gemini. This PN is shown quite rarely and the outer edge areas are so weak that these can usually not be seen at all on photos...

      Reason enough to try it anyway! :-) An integration time of 11.25 hours only for H-alpha was then sufficient to work out the area of the halo. It looks as if a real wave movement is making its way here. There are also extremely many structures in the core area around the white dwarf star, which causes all this. Hope you like it :-)

      Comments

      Sky plot

      Sky plot

      Histogram

      Abell 21 (SH2-274) - The Medusa Nebula (Bicolor), 



    
        

            Frank Breslawski