Stewart Sharpless of the U.S. Naval Observatory published his catalog of 313 HII regions in 1959. This image contains 5 of them.
Sh2-257 is a bright nebula in the star formation region Sh2-254 to Sh2-258. This region is part of the GEM OB1 molecular cloud. It is located on the border of the constellations Orion and Gemini.
SH2-255 is the small bright one to the right. Left of that in the middle is SH2-257, and SH2-254 is the largest. The two smaller ones are SH2-256 and SH2-258. Not much here for a wider field of view but the larger telescope can define the structure very well.
