Hello all,
I would like to propose the supernova remnant W63. My suggestion would be 15 hours Ha, 15 hours Oiii and 8 hours Sii. The values are based on a picture I found on Astrobin.
Link to the image: https://astrob.in/uj6plw/B/
The picture was taken with a F4 telescope. Therefore I think that we will also need so much exposure time. What is your opinion?
Greetings and CS
Darius