Hemisphere:  Southern  ·  Constellation: Sagittarius (Sgr)  ·  Contains:  IC 1274  ·  IC 1275  ·  IC 4684  ·  IC 4685  ·  NGC 6559

Image of the day 03/15/2018

    IC 4685 in Sagittarius, 



    
        

            Terry Robison
    IC 4685 in Sagittarius
    Powered byPixInsight

    IC 4685 in Sagittarius

    Image of the day 03/15/2018

      IC 4685 in Sagittarius, 



    
        

            Terry Robison
      IC 4685 in Sagittarius
      Powered byPixInsight

      IC 4685 in Sagittarius

      Technical card

      Imaging telescopes or lenses: RC Optical Systems RCOS 10" Ritchey-Chrétien

      Imaging cameras: SBIG STL-11000M

      Mounts: AP900GTO Astro Physics

      Guiding cameras: SBIG AO-L

      Filters: Baader Planetarium H-a  ·  Astrondon Astrodon

      Accessory: SBIG AO-L


      Dates:June 29, 2017

      Frames: 42x900" (10h 30')

      Integration: 10h 30'

      Avg. Moon age: 5.90 days

      Avg. Moon phase: 34.48%


      Basic astrometry details

      Astrometry.net job: 1957275

      RA center: 18h 9' 53"

      DEC center: -23° 50' 9"

      Pixel scale: 0.803 arcsec/pixel

      Orientation: 291.915 degrees

      Field radius: 0.537 degrees


      Resolution: 4008x2672

      Data source: Own remote observatory

      Remote source: Non-commercial independent facility

      Description

      IC4685 can be found in the constellation of Sagittarius. For reference, the Lagoon Nebula is only 1.25 degrees away. The estimated distance is about 4000 light years away. The image includes a dense star cloud with many colourful stars, and both emission and reflection nebula.

      NGC 6559 located in the lower left part of the image resembles an oyster. IC4685 has that dark snaky river flowing through the nebula in the lower part of the image. A Hydrogen Alpha filter was used to get that nice contrasty look, highlighting the delicate filaments of the black rivers running through the nebula.

      My favourite part of the image is IC1274 located just to the right and up from centre. It includes subtle milky white structures running across, a complete contrast to the dark river like areas in the lower left part of the image.

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