Hemisphere:  Southern  ·  Constellation: Ophiuchus (Oph)  ·  Contains:  22 Sco  ·  5 Oph  ·  IC 4603  ·  IC 4604  ·  IC 4605  ·  The star i Sco  ·  The star ρ Oph  ·  rho Oph Nebula

Image of the day 05/21/2022

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    IC 4604 and friends. The Rho Ophiuchi Nebula, 



    
        

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    IC 4604 and friends. The Rho Ophiuchi Nebula
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    IC 4604 and friends. The Rho Ophiuchi Nebula

    Image of the day 05/21/2022

    Getting plate-solving status, please wait...
      IC 4604 and friends. The Rho Ophiuchi Nebula, 



    
        

            Steeve Body
      IC 4604 and friends. The Rho Ophiuchi Nebula
      Powered byPixInsight

      IC 4604 and friends. The Rho Ophiuchi Nebula

      Equipment

      Imaging Telescopes Or Lenses
      William Optics Zenithstar 73
      Imaging Cameras
      ZWO ASI1600MM Pro
      Filters
      Antlia Pro Red · Antlia Pro Green · Antlia Pro Blue
      Accessories
      ZWO EAF Focuser · Pegasus Falcon Rotator · Pegasus Mini Powerbox · Intel NUC 8 I5BEK · William optics flat/reducer 73
      Software
      RC-Astro StarXTerminator · NoiseXTerminator · Pixinsight 1.8.8.5 · NINA,PhD2 · Astro Pixel Processor
      Guiding Telescopes Or Lenses
      William Optics UniGuide 50/200MM
      Guiding Cameras
      ZWO ASI 120MM Mini Guide Camera

      Acquisition details

      Dates:
      May 1, 2022
      Frames:
      Antlia Pro Blue: 60x300" (5h) (gain: 139.00) f/5.9 -10°C bin 1x1
      Antlia Pro Green: 60x300" (5h) (gain: 139.00) f/5.9 -10°C bin 1x1
      Antlia Pro Red: 60x300" (5h) (gain: 139.00) f/5.9 -10°C bin 1x1
      Integration:
      15h
      Darks:
      30
      Flats:
      30
      Bias:
      100
      Avg. Moon age:
      0.60 days
      Avg. Moon phase:
      0.41%
      Bortle Dark-Sky Scale:
      2.00

      Basic astrometry details

      Astrometry.net job: 5771145

      RA center: 16h26m49s.2

      DEC center: -24°1557

      Pixel scale: 2.936 arcsec/pixel

      Orientation: 115.019 degrees

      Field radius: 1.772 degrees

      Resolution: 3863x1989

      Data source: Traveller

      Description

      This is officially my first RGB picture without using narrowband filters. Taken from a bortle 2 zone during the new moon in the little town of Tolmie in country Victoria, Australia.  This is about 15h of data across 2 panels. My FOV does not allow me to capture the whole of the Rho Ophiuchi complex, so this is the best I could do with the time I had.

      Funny enough I did not combine  the luminance channel with this data as I found that it washed out of a lot of the details in the blue channel, detail that just was not really visible in the luminance channel, no matter how hard I have tried to pull it out, so this is a straight RGB picture.

      Description for my non astrophotographer friends :Compared to other nebulas I have captured, which have been mostly (all actually) emission nebula (meaning the gasses actually emit light because of nearby stars inducing a electrical charge within the gas.. a bit like a neon light if you’d like) this one is a collection of reflection nebulae, meaning the only reason we see the gasses and dust lanes here is because of big bright stars shining their light onto it, like a light bulb would lit a room or object.

      To properly capture these kind of objects you need to use regular colour filters, red, green and blue, with no moon around and a very dark sky… so impossible from our backyard in the city.The blue colours present here are due to the type of star shining its light onto the surround gasses, here mostly blue because of blue giant stars, which are the some of brightest and largest in the universe. The dark dusty gasses are only visible because there are standing in front of these bright colourful gasses, otherwise we would not be able to see those. So if I were to make this a 3D picture, these dark lanes would be on top of everything else.

      Comments

      Revisions

        IC 4604 and friends. The Rho Ophiuchi Nebula, 



    
        

            Steeve Body
        Original
      • Final
        IC 4604 and friends. The Rho Ophiuchi Nebula, 



    
        

            Steeve Body
        C

      C

      Description: minor chromatic noise reduction

      Uploaded: ...

      Sky plot

      Sky plot

      Histogram

      IC 4604 and friends. The Rho Ophiuchi Nebula, 



    
        

            Steeve Body