Supernova or foregroundstar?
#asteroid bottom left
by Budgieye moderator
The redshift of target galaxy is 0.019247. At that distance, I would expect a supernova of hot hydrogen to be green.
Redshift of galaxies. http://talk.galaxyzoo.org/#/boards/BGZ0000007/discussions/DGZ0000ulp?page=2
Also, it looks very similar to the blue star to the left.
No mention of a supernova in that galaxy in NED.
Thanks Budgieye 😃