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Globular Cluster M4: This Globular Cluster in the constellation of Scorpius can be observed in the direct neighbourhood of the Red Supergiant Antares. It is with about 7000 LY the closest Globular Cluster, but also one of the oldest ones, as can be seen by the plentitude of yellowish giant stars in this image.

The image was taken at the IAS astronomical site at the Hakos farm in Namibia.

Object Globular Cluster M4
Category IAS Hakos, Namibia
Designation M 004
Constellation Scorpius
Optics Keller 20 inch Cassegrain f/9 in corrected secondary focus
Mount Liebscher GEM
Camera SBIG STL-11000M with internal CFW 5
Exposure 3 x 10min each Baader RGB filterset. Maxim DL for image acquisition
Calibration Dark Frame
Guiding StarlightXpress Lodestar on Schneider OAG, Maxim DL as Guiding Software
Processing Maxim DL5, CCD Stack, Photoshop. Color Code R,G,B
Location-Date IAS-Hakos, Namibia - 5 Apr 2011
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