|Equipment:||SBIG ST2000XM with CFW8a and Astronomik type 2c LRGB filter set through WO ZS105ED telescope on Losmandy GM8 mount. WO ZS105ED working at f5.6 with WO 0.8X reducer/flattener.|
|Exposure time:||6X4min Luminance binned 1X1, RG&B 4X3min each binned 2X2.|
|Comment:||M4 was low on the horizon (below 17 degrees), color data were affected|
in constellation of Scorpius is the closest to us globular cluster. It
would be one of the most spectacular objects on our sky, if it weren't
obscured by heavy clouds of dark interstellar matter in the galactic plane.
That both dims and reddens its light. It is one of the loosest globular
clusters and it has a remarkable feature in the form of a central bar
of stars. Although containing hundreds of thousands of stars within diameter
of 75 ly, M4 is one of the smallest and sparsest globular clusters known.
M4 distance is 7200 ly.
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