Cool Andrew , I wont forget the 1st time I spotted B as well , in my 10 inch f/10 newt , but unlike you I seen it in the evening
Twilight , bang
! there it was after all those years of looking for it .
Thats a tick for you with many , many more to follow , especially with a 12 incher . A life time's worth of discoveries you have .
I wonder if the 1/2 light at twilights helps ? .as sirius is very bright .
Brian.