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... М3 < М4 > М5 ...
Globular star cluster M4
Globular star cluster M4 is in the constellation Scorpius (Sco).
Equatorial coordinates (epoch J2000):
Visual magnitude: 5,6m - this object can be seen with the naked eye on a black sky, in the absence of illumination from street lighting.
M4 in the middle latitudes is located quite low above the horizon, so observation is difficult due to atmospheric distortions.
The best month for observing M4 is June. At this time, the object is at midnight near its highest point in the sky, that is, it is less affected by light from the lanterns and atmospheric distortions.
For observers in the northern and middle latitudes:The nights in June are very light, so try to observe M4 also in May and in July.
Nikolay Kurdyapin, astro-map.com
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