Here you go Marco. I was using Alpha Cent to focus and test tracking and had this image. It is a 960s single exposure without any correction in NII 3nm. The Bright star is Alpha Cent. 4MB
http://d1355990.i49.quadrahosting.co...2_06/ACfoc.jpg
I wondered about the faint what looks like a SN remnant to the right of the image and thought I must explore this further. There is some faint signal in NII of your object.
Bert