Cassiopeia (constellation) - Wikipedia
https://en.wikipedia.org/wiki/Cassiopeia_(constellation)The German cartographer Johann Bayer used the Greek letters Alpha through Omega, and then A and B, to label the most prominent 26 stars in the constellation. Upsilon was later found to be two stars and labelled Upsilon and Upsilon by John Flamsteed. B Cassiopeiae was in fact the supernova known as Tycho's Supernova. Within the constellation's borders, there are 157 stars brigh…