Planetary nebula IC 5148
Telescope/lens: ASA 40" Ritchey–Chretien
Camera: FLI Proline 16803 CCD Camera
Exposure and filters: OIII H-alpha RGB 26 hours total exposure
Location: Chilescope observatory, Chile
Image data acquired remotely
I`ve found the interesting article about this nebula https://arxiv.org/pdf/1810.01350.pdf.
In the article in Chapter 4.2 you can see a description of multiple outer faint halo rings around the nebula. The rings were worked out very well, also their centers are located close to the main star, but not exactly match with it. I represent the rings and their centers in the attachment.
Also, processing diagram is provided (On astrobin page).
Edited by Stas Volskiy, 23 February 2021 - 11:40 AM.