Physical Characteristics
The Jewel Box cluster is one of the youngest known open clusters. It contains the M-type supergiant Kappa Crucis.
The mean radial velocity of the Jewel Box cluster is −17.9 kilometres per second (−11.1 mi/s).
The brightest stars in the Jewel Box cluster are supergiants, and include some of the brightest stars in the Milky Way galaxy.
Calculating its distance is difficult due to the proximity of the Coalsack Nebula, which obscures some of its light.
Read more about this topic: Jewel Box (star Cluster)
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—Willard Van Orman Quine (b. 1908)