HD 121228 is a

blue supergiant A blue supergiant (BSG) is a hot, luminous star, often referred to as an OB supergiant. They have luminosity class I and spectral class B9 or earlier. Blue supergiants are found towards the top left of the Hertzsprung–Russell diagram, above an ...

star located in the constellation Centaurus. The star is noted for its close visual proximity to the planetary nebula SuWt 2.

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See also