LDN 1251 is the large dark nebula across most of the field of view.
LDN 1257 is a smaller dark nebula on the right.
See the annotated image for more information.
Luminance – 12x600s – 120 minutes – binned 1x1
RGB – 8x300s – 40 minutes each – binned 2x2
240 minutes total exposure – 4 hours
Imaged on September 8th, 2021 at the Danville Conservation Area (New Florence, Missouri) with a SBIG ST-8300M on an Astro-Tech AT90EDT at f/6.7 603mm.
LRGB – https://www.flickr.com/photos/dcrowson/52238895385/sizes/l/
LRGB annotated - https://www.flickr.com/photos/dcrowson/52238895325/sizes/l/