Hello fiends of the supernova remnants,

and thanks to Oliva and Uwe for the sketches!

According to the deep astrohotos my impression is, that the Simeis 147 is a bundle of very thin filaments, requiring large apertures to see at least some of these filaments.

On the side of the small apertures and big binoculars, the trick is to observe at the lowest magnifications to visually turn this SNR into a sort of donut of unresolved filaments.

During 2020/2021, I have had 4 successful observatins through the 15x85 (BA 8 Kunming) binoculars. The best view has been through the OIII filters, some condensations on the "donut" became visible through the H-Beta and blue(RGB)CCD filters.

Rating the difficulty to see at least something on the Sim 147,
I would say that the SNR G179.0+2.6, south of M37 in Auriga, has been more difficult for my eyes.
Also in Auriga, another SNR, the Sh2-224 (G166.0+4.3) has been definitely easier to see than the Sim 147.

A good reference object for checking the transparency of skies in this area is the 'forgotten' Gaze Shajn [GS-55]75, a N-S streak (90 arcmin long) between M36 and M37.

Clear skies,
Jiri