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                           Astronomy Picture of the Day   
      
       Discover the cosmos! Each day a different image or photograph of our   
         fascinating universe is featured, along with a brief explanation   
                       written by a professional astronomer.   
      
                                    2022 May 28   
      
                       RCW 86: Historical Supernova Remnant   
                       Image Credit & Copyright: Martin Pugh   
      
      Explanation: In 185 AD, Chinese astronomers recorded the appearance of   
      a new star in the Nanmen asterism. That part of the sky is identified   
      with Alpha and Beta Centauri on modern star charts. The new star was   
      visible for months and is thought to be the earliest recorded   
      supernova. This deep image shows emission nebula RCW 86, understood to   
      be the remnant of that stellar explosion. The narrowband data trace gas   
      ionized by the still expanding shock wave. Space-based images indicate   
      an abundance of the element iron and lack of a neutron star or pulsar   
      in the remnant, suggesting that the original supernova was Type Ia.   
      Unlike the core collapse supernova explosion of a massive star, a Type   
      Ia supernova is a thermonuclear detonation on a a white dwarf star that   
      accretes material from a companion in a binary star system. Near the   
      plane of our Milky Way galaxy and larger than a full moon on the sky   
      this supernova remnant is too faint to be seen by eye though. RCW 86 is   
      some 8,000 light-years distant and around 100 light-years across.   
      
                    Tomorrow's picture: a galaxy cluster forms   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Phillip Newman Specific rights apply.   
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                                & Michigan Tech. U.   
      
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