Cassiopeia

Sigma 35mm/F1.4 Art @ F4
Nikon D800 (modified for astrophotography)
total exposure time = 2.0 hr
more details in <a href="https://www.astrobin.com/328327/" rel="noreferrer nofollow">www.astrobin.com/328327/</a>

You can find comet 2017 O1 near the upper-left border.