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|H II region|
Credit: David St. Louis
|Observation data: J2000.0 epoch|
|Right ascension||20h 00m 29.37s|
|Declination||35° 19′ 13.9″|
|Distance||6,000 ly (1,800 pc)|
|Apparent magnitude (V)||9.0|
|Apparent dimensions (V)||16' x 9'|
|Designations||Sharpless 101, Sh2-101, Cygnus Star Cloud|
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.
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