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NGC 4755-3
NGC 4755 Chile Two telescope of the Slooh network and processing with pixinsight. NGC 4755 (also known as the Casket of Joys or C 94) is a famous open cluster located within the limits of the small but very bright constellation of the Southern Cross; It is also visible to the naked eye and is one of the best-known open clusters in the Southern Hemisphere.
It is easily spotted, less than one degree southeast of Mimosa, the star β the Cross, just north of the dark Coalsack nebula. It is also visible to the naked eye and with the help of 8x40 or 10x50 binoculars you can already see its most evident feature, namely the strong contrast between the red color of one of its main stars (which would be extraneous to the cluster, and would appear superimposed only for an optical effect), and the dominant one of the cluster, which is instead composed of white and blue stars; precisely this contrast of colors, which suggests a set of multicolored jewels, is at the origin of the proper name of NGC 4755, Scrigno di Gioie. A small refractor telescope is already enough to completely resolve it into stars.
Its declination is strongly austral and means that this cluster is not observable from many of the inhabited regions of the northern hemisphere, such as Europe and almost all of North America; from some inhabited regions of the southern hemisphere, on the contrary, it is circumpolar, as from the large cities of Sydney and Melbourne in Australia and from Cape Town in South Africa. The best time for its observation in the evening sky is between February and August.
NGC 4755-3
NGC 4755 Chile Two telescope of the Slooh network and processing with pixinsight. NGC 4755 (also known as the Casket of Joys or C 94) is a famous open cluster located within the limits of the small but very bright constellation of the Southern Cross; It is also visible to the naked eye and is one of the best-known open clusters in the Southern Hemisphere.
It is easily spotted, less than one degree southeast of Mimosa, the star β the Cross, just north of the dark Coalsack nebula. It is also visible to the naked eye and with the help of 8x40 or 10x50 binoculars you can already see its most evident feature, namely the strong contrast between the red color of one of its main stars (which would be extraneous to the cluster, and would appear superimposed only for an optical effect), and the dominant one of the cluster, which is instead composed of white and blue stars; precisely this contrast of colors, which suggests a set of multicolored jewels, is at the origin of the proper name of NGC 4755, Scrigno di Gioie. A small refractor telescope is already enough to completely resolve it into stars.
Its declination is strongly austral and means that this cluster is not observable from many of the inhabited regions of the northern hemisphere, such as Europe and almost all of North America; from some inhabited regions of the southern hemisphere, on the contrary, it is circumpolar, as from the large cities of Sydney and Melbourne in Australia and from Cape Town in South Africa. The best time for its observation in the evening sky is between February and August.