Image information:

Date: 06/19/2022
Equipment: Altair Hypercam 533C colour camera through APM/LZOS 105/650 APO telescope using IDAS LPS filter on Losmandy GM8 mount. The telescope was working at f6.2 with Astro-Tech 2" field flattener.
Image type: OSC
Exposure time: 80X1min, gain 250 (0.8e/ADU).
Comment: M4 was low on the horizon (below 17 degrees), color data were affected

Object information:

Object designations:

M4, NGC6121
Object type:
Globular cluster
Object size:
Constellation: Scorpius
M4 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.

Related images:

List of related images:

M4 , LRGB, ST2000XM through WO ZS105ED telescope