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      UGCA 205 - Sextans A Dwarf Galaxy
      Wallpaper author:
      Michal Wierzbinski

      02 Aug 2025

      UGCA 205 - Sextans A Dwarf Galaxy

      UGCA 205, also known as Sextans A, DDO 75 and PGC 29653, is a dwarf irregular galaxy located about 4.31 million light-years away in the constellation Sextans. Discovered by Fritz Zwicky in 1942, it lies on the outskirts of the Local Group as part of the NGC 3109 subgroup. Roughly 5,000–8,000 light-years across, Sextans A is noted for its unusually "square" appearance, traced by chains of young blue star clusters along expanding star-forming shells.


      This 7-hour LRGB image was acquired from Telescope Live’s site at El Sauce Observatory in Chile using 24-inch PlaneWave CDK24, capturing the galaxy’s patchy H II regions and clumpy stellar associations despite its low surface brightness. Apart from a few pesky dust donuts I had no major issues with processing of this dataset.


      Sources:

      en.wikipedia.org

      spider.seds.org


      Data credit: Telescope.Live

      Dataset from which the image was processed

      UGCA 205

      5 credit

      Open
      Telescope Live
      CHI-1-CCD
      • Type of target
        ............................................................................................................................
        Galaxy
      • Camera
        ............................................................................................................................
        FLI ProLine PL9000
      • Target coordinates
        ............................................................................................................................
        RA 152.7521 Dec -4.69167
      • Hemisphere
        ............................................................................................................................
        Southern
      • Telescope location
        ............................................................................................................................
        Chile
      • Transient event
        ............................................................................................................................
        No
      • Observed on
        ............................................................................................................................
        06 Feb 2022 - 30 Dec 2022
      Filter
      Avg Exp (s)
      Total Exposure
      Subframes
      Luminance5451h40m11
      Red6001h50m11
      Green6601h50m10
      Blue6001h40m10

      UGCA 205 - Sextans A Dwarf Galaxy