IC 2966 is a small nebula in the Southern constellation Musca - seen Left of the middle
Surrounding it is an ancient Super nova remnant seen as a red sphere around it.

Ha-LRGB image
Ha-6 HRS bin 2
L - 120 min bin 1
RGB - 30 min each bin 2

16" F3.75 Dream scope
Imaged from Tivoli farm Namibia

A comment from Sakib Rasool:
The large nebula isn't a SNR however. It is a filamentary Ha shell called G296.2-2.8