Sharpless 101 (Sh2-101) is a H II region emission nebula located in the constellation Cygnus. It is sometimes also called the Tulip Nebula because it appears to resemble the outline of a tulip when imaged photographically. It was catalogued by astronomer Stewart Sharpless in his 1959 catalog of nebulae. It lies at a distance of about 6,000 light-years (5.7×1016 km; 3.5×1016 mi) from Earth.
Sh2-101, at least in the field seen from earth, is in close proximity to microquasar Cygnus X-1, site of one of the first suspected black holes. Cygnus X-1 is the brighter of the two stars (lower star) in close vertical proximity just to the right of Sh2-101 in the image presented here. Its curved shockwave can be seen between the two bright stars and the Tulip Nebula (Wikipedia).
HaRGB composition, total integration 10.5 hrs, September 2015. Takahashi FSQ85 EDX at F3.9 - Avalon Linear Fast Reverse - QSI683-wsg - Astrodon LRGB & 5nm NB filters.