After reading about 1987A event. It was clear that that star underwent a shedding event 20000 year ago.
Is it possible that what we are currently witnessing something similar with Betelgeuse?
Credence to this, are observations done during December last year.
Detail study of red giants within M62, Hyades or Coma clusters, can most likely provide additional information (or other open clusters), as they should have red giants within them, which must be further along in this phase of their stellar evolution.
Further more, given that most planetary nebula don't always look the same, it would be wise to see the correlation between mass, intrinsic brightness of a SN event and the stellar remnant, in order to validate our current theories on these events are yard sticks in cosmology.
Edited by Gvs, 14 February 2020 - 03:30 PM.