Globular star cluster M69
Globular star cluster M69 is in the constellation Sagittarius (Sgr).
Equatorial coordinates (epoch J2000):
Ra 18h 31.4m, Dec -32° 21'
Visual magnitude: 9,0m
Distance to the star clusters M69 to the Sun is 36920 light years
Angular size: 10'
External dimensions the star clusters M69 are about 110 light years.
Estimated weight the star clusters: 300x103 suns
Discoverer: Charles Messier, 31.08.1780 year.
The designation M69 in other catalogs: NGC 6637
M69 is located too far in the southern hemisphere of the sky and is not visible in the north and in the middle latitudes.
In southern latitudes it is located low above the horizon - observation is hampered by atmospheric distortions.Optimum magnification for a telescope with observations of M69, depending on the aperture of the telescope (D), is about D/3-0.8D. Higher magnifications of course add details, but lead to a strong drop in the brightness of the image, making it difficult to observe.
The best month for observing M69 is July.
For observers in the northern latitudes:
The nights in July are still quite light, so it makes sense to try to observe M69 also in August.
The first half of August is also not very dark, in addition the object will be at midnight not at its highest point,
which provides the least exposure and atmospheric distortion. But, the difference is not so noticeable.
And already in the second half of August the night sky becomes quite dark for observations (although in September it will more darker).
The farther south the place of your observation is located, the earlier the sky will darken - both in time on the clock and on the calendar.
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