This is the Stingray Nebula, or officially SH2-63. SH is the designation from the Sharpless Catalogue which lists emission nebula. It is in the constellation of Sagittarius. It is a very faint, dim and dusty nebula, a collection of dust in this case, located about 700 light years away. The Stingray is so faint this final image is a combination of about 20 hours of images. I shot it last year and only now have a few more processing skills in order to bring out the very faint detail. I find these dark nebula aren't as showy as other emission nebula, but are still quite interesting, subtle and challenging to both image and process. The Astrobin link is :
https://www.astrobin.com/52va69/ .