description Sh2-199 Overview
Sh2-199, commonly known as the Soul Nebula or W5, is a large emission nebula located in the constellation Cassiopeia. It is an H II region situated approximately 7,500 light-years from Earth. The nebula is an active star-forming region that has been extensively studied by infrared observatories like the Spitzer Space Telescope. Researchers observe it to better understand the processes of triggered star formation, where radiation and winds from older stars compress gas to create new ones.
help Sh2-199 FAQ
What are the other names for Sh2-199?
Sh2-199 is commonly called the Soul Nebula and is also known as W5, IC 1848, and LBN 667. These names come from different astronomical catalogs and observing traditions.
Where is the Soul Nebula located?
It is an H II region in the constellation Cassiopeia, near the Heart Nebula. NASA places the Soul Nebula at about 6,500 light-years away and describes the surrounding cloud as more than 150 light-years across. [NASA](https://science.nasa.gov/photojournal/soul-nebula/)
Why is Sh2-199 important for star-formation research?
The nebula contains an open cluster and extensive ionized gas, making it a large active stellar nursery. Infrared observations are useful because they can reveal young stars and dusty structures hidden from ordinary visible-light surveys.
Is Sh2-199 the same object as the Heart Nebula?
No. Sh2-199 is the Soul Nebula, while the nearby Heart Nebula is usually cataloged as IC 1805 and Sh2-190. They are neighboring star-forming regions in Cassiopeia and are often photographed together.
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