Possible supernova site?


This faint bluish star seems to be roughly at the centre of a large “bubble” that is visible in the H-Alpha map, and which also coincides with the pale greenish arc that I reported yesterday:

“Very faint greenish arc covering most of the frame”

This is the “bubble” in the H-Alpha map that seems to be centred on this faint star (zoom level 9 - it’s pretty big)