This one I was hunting for, for a long time. Finally.
Good conditions! One of my best deep sky!
M78 is the brightest diffuse reflection nebula in the sky
and is about 1,600 light years distant.
As a reflection nebula, M78 is a cloud of interstellar dust
which shines in the reflected and scattered light of bright blue
(early B-type) stars, among them the brightest, HD 38563A,
and second-brightest HDE 38563B, both of about 10th
visual apparent magnitude.
M78 measures almost 4 light years in extension.