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Catalogue and alternative designations NGC 4755, Jewel box cluster.  Also visible in this frame are Beta Crucis, RCW 71 and the open cluster NGC 4852


Type Open cluster 
Position  13 26.8, -47 29
Constellation Crux
Camera and Telescope STL11000M and FSQ106ED
Focal Ratio F5
Exposure Details LRGB 30:30:30:30 All 1x1 with Baader filters
Description NGC 4755 is one of the best open clusters in the sky and an easy object with binoculars.  RCW 71 is a nebula that is strongly reddened by absorption in the coal sack dark nebula, part of which is visible at the right.