Well that is what it is also called NGC 2516: The Diamond Cluster. Located deep south in the constellation of Carina, this cluster contains more than 100 starsThe brightest member is a red giant shining at magnitude 5. NGC 2516 is very easy to spot for the naked eye in darks locations. Since the cluster is rather big, binoculars tend to give the best view. The Cluster was discovered by French Astronomer Abbe Lacalle in 1751-1752.
The image was taken with a 6 inches OOUK f5 Newtonian and a QSI 583 WS riding in a NEQ6 for a total exposure time of two and a half hours, 100 north from Buenos Aires Argentina.
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