LDN 778 is part of a dark nebula complex in Vulpecula about 3.7 degrees north of the "Coathanger". It is the dark diagonal streak that doesn't quite fit my field of view. I suppose it would if I'd have rotated the camera from my normal north up position. The dark nebula in the upper left corner is LDN 782. Toward the upper end of LDN 778 is the reflection nebula, GN 19.24.6 which appears lit by the variable star PX Vulpecula. It's an Orion type variable. These are irregular eruptive variable stars often found with reflection nebula such as seen here. They are thought to be very young or proto-stars not quite ready to settle down to main sequence status. The term encompasses several types of eruptive stars including T Tauri and FU Orionis stars. PX Vulpecula is a T Tauri class star.

I've reproduced this one at 1.5" per pixel as there's nothing needing greater resolution.

14" LX200R @ f/10, L=4x10' RGB=2x10', STL-11000XM, Paramount ME