SN 1885A [SEP] constellation
SN 1885A
SN 1885A (also S Andromedae) was a supernova in the Andromeda Galaxy, the only one seen in that galaxy so far by astronomers. It was the first supernova that was ever seen that was outside the Milky Way, though it was not appreciated at the time how far away it was. It is also known as "Supernova 1885".
Discovery.
It appears to have been seen first on August 17, 1885, by French astronomer Ludovic Gully during a public stargazing event. Gully at
with modern data on typical supernovae of Type Ia; so SN 1885A had been assigned to this type. Recent studies led by Dovi Poznanski and by Hagai Perets suggest that SN 1885A belongs in a new subclass of Type I supernovae along with SN 2002bj and SN 1939B.
The location of the supernova event was 16″ from the relatively bright nucleus of the galaxy. This made detection of the supernova remnant difficult, and multiple attempts proved unsuccessful. Finally, in 1988, R. A. Fesen and others using the 4-meter Mayall telescope at Kitt