AAO image reference AAT 25. « Previous || Next »
Top left is NE. Image width is about 11.5 arc min
Image and text © 1991-2002, Anglo-Australian Observatory, photograph by David Malin.
This famous group of young bright stars is an open cluster some 7800 light years from the Sun. It was named the Jewel Box from its description by Sir John Herschel as 'a casket of variously coloured precious stones', which refers to its appearance in the telescope. The bright orange star is kappa Crucis, and it contrasts strongly against its predominantly blue, hot companions. Kappa Cru is a very large, (hence very luminous) quite young star in its red supergiant stage, which paradoxically indicates that its life is drawing to a close. The cluster is looks like a star to the unaided eye and appears close to the eastern-most star of the Southern Cross, so is only visible from southern latitudes. Click here for bigger image.
Entry from NGC 2000.0 (R.W. Sinnott, Ed.) © Sky Publishing Corporation, 1988:
NGC 4755 OC 12 53.6 -60 20 s Cru 10. 4.2 Cl, vL, st vB (kappa Cru)For details of photographic exposure, search technical table by AAT reference number