Designation: NGC 4755 / Caldwell 94
Distance: 6,440 light years
Object type: Open cluster
The Jewel Box is an open cluster of stars lying some 6,440 light years from us, in the southern constellation Crux. It is one of the youngest known open clusters, with an estimated age of 14 million years. The cluster spans approximately 20 light years across and contains just over 100 stars, in large part massive blue stars with a red supergiant standing out among them.
Also known as the Kappa Crucis Cluster, it was first discovered by the French astronomer Nicolas Louis de Lacaille in 1751–1752. The name “Jewel Box” came from British astronomer John Herschel, who described the cluster as “…a superb piece of fancy jewellery”.
Total integration time: 10 hours 50 minutes
Acquisition software: CHI-1 (Telescope Live)
Processing software: PixInsight