Jewel Box (NGC 4755)
The Jewel Box (NGC 4755) is an open cluster of about 100 stars in
the constellation Crux, also known as the Kappa
Crucis Cluster after its most prominent member, a blue
supergiant (visual magnitude 5.89, absolute magnitude -6.10, spectral
type B5Ia). Located near Beta Crucis, the Jewel Box was discovered by Nicolas Lacaille when he was in South Africa in
1751-52. It is one of the youngest clusters known, with an estimated age
of less than 10 million years. Nearby lies the Coalsack.
||R.A. 12h 53.6m, Dec. -60° 20'
AND STAR CLUSTERS