I am looking for examples where amateur astronomers in these days contributed sigificantly to important scientifically discoveries.
I am aware of one example: Victor Buso from Argentina was lucky enough to observe a Supernova just when it formed, which has led to follow-up observations by large scientific observatories, and in the end resulted in a Nature article which has Buso as a co-author.
What might some other similar examples be?
below: "Astronomer Victor Buso poses in front of the telescope with which he witnessed the birth of the supernova 2016gkg. (Victor Buso)" From here, borrowed from Does this amateur observation hold a record even including robotic searches for supernovae?. Click/open for full size.