SH2-261, or Lower's Nebula, is a Hydrogen Alpha emission region located in the upper area of Orion, near the Gemini constellation. Image covers about a same area as a full Moon. There is no information about the distance of this hydrogen cloud, so we are not able to determine how large it is.

The nebula is named after amateur astronomers Harold Lower and his son Charles, who discovered this nebula in 1939 from a picture taken with their homemade 8 inch, f/1 Schmidt camera.