SN 1986G is a supernova that was observed on May 3, 1986 by Robert Evans. It is about 15 million light-years away in the constellation Centaurus that means that this supernova happened 15 million years ago.
It was a bright blue-green star in the middle of the left part of the dust belt of Centaurus A.

• I HAVE USED THIS WEBSITE TO FIND OUT WHICH ELEMENTS MAKE UP SN 1986G

  As	33
  Gd	64

I have found this article from Monthly Notices of the Royal Astronomical Society where they have descovered that the elements that form the supernova are Oxygen, Carbon and Nitrogen.
O+C = 0.34 M⊙, EMI = 0.69 M⊙, stable NSE = 0.21 M⊙ and 56Ni = 0.14 M⊙.

These results don't match with mine, I have found that it has As and Gd. Most likely my results are wrong as this is a scientific article.