description Campbell's Hydrogen Star Overview
Campbell's Hydrogen Star is the central star of a compact planetary nebula in the constellation Cygnus. It was noted in connection with the spectral work of W. W. Campbell in 1893, and the surrounding nebula is associated with the catalog designation PK.
The object is studied as an evolved star whose surrounding shell records a late stage in stellar evolution.
help Campbell's Hydrogen Star FAQ
What is Campbell's Hydrogen Star?
Campbell's Hydrogen Star is the central star of a compact planetary nebula in Cygnus. The star is also known as HD 184738.
What is the nebula around Campbell's Hydrogen Star called?
The surrounding nebula is commonly identified as PK 64+5.1. The object is a small planetary nebula rather than a planet-forming disk.
Why is Campbell's Hydrogen Star unusual?
Its stellar wind and spectrum make it resemble a Wolf-Rayet star, while observations show hydrogen-rich characteristics unusual for many central stars of planetary nebulae. NASA identifies HD 184738 as the bright central star in the nebula.
Who was W. W. Campbell in relation to this object?
The object was noted in connection with the spectral work of W. W. Campbell in 1893. Campbell was an astronomer known for pioneering astronomical spectroscopy.
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