description Sh2-101 (Tulip Nebula) Overview
Sh2-101, commonly known as the Tulip Nebula, is an emission nebula located in the constellation Cygnus. It consists of ionized hydrogen gas that glows in visible light when energized by ultraviolet radiation from nearby hot stars, and it is associated with regions of star formation. Its popular name derives from the nebula's apparent floral shape in long-exposure astrophotography, particularly through hydrogen-alpha filters. The nebula lies in close angular proximity on the sky to Cygnus X-1, a binary system containing a stellar-mass black hole and the first widely accepted astronomical X-ray black hole candidate.
help Sh2-101 (Tulip Nebula) FAQ
What is Sh2-101, and why is it called the Tulip Nebula?
Sh2-101 is an H II region, meaning an emission nebula made of ionized gas, in the constellation Cygnus. It is called the Tulip Nebula because photographs can make its outline resemble a tulip.
How far away is the Tulip Nebula?
The Tulip Nebula is commonly described as being about 6,000 light-years from Earth. Distance estimates vary by source, so that figure is best treated as an approximate value.
What makes the Tulip Nebula glow?
Ultraviolet radiation from nearby hot stars energizes the hydrogen gas, causing the emission nebula to glow. Sh2-101 is therefore associated with ionized gas and ongoing star-forming activity.
Where should an astronomer look for Sh2-101?
Look in Cygnus, the constellation often called the Swan. Sh2-101 is also known by the catalog name Sharpless 101, which is useful when searching astronomy software or imaging catalogs.
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