Tried Thor's Helmet a few nights ago, but very low in the sky (around 30 deg). Not much luck, but posting what I got after much histogram massaging in Polarr :).
Also Shot M51 last night, which came out much better (around 50 deg):
Image set up: ASI294MCPro, Celestron C8 with 0.63 reducer
Guide set up: ASI385, AT80 with 0.8 reducer.
Captured with LiveStack in SharpCap and some post processing with Polarr
Thor's Helmet: 7 frames, 2100 secs
M51: 4 frames, 1200 secs
Mounts: EXOS II PMC-Eight, LXD75
Cameras: ZWO ASI294MCPro, ASI385