Globular star cluster M12
Globular star cluster M12 is in the constellation Ophiuchus (Oph).
Equatorial coordinates (epoch J2000):
Ra 16h 47.2m, Dec -01° 57'
Visual magnitude: 8,0m
Distance to the star clusters M12 to the Sun is 20760 light years
Angular size: 14'
External dimensions the star clusters M12 are about 85 light years.
Estimated weight the star clusters: 250x103 suns
Discoverer: Charles Messier, 1764 year.
The designation M12 in other catalogs: NGC 6218
Optimum magnification for a telescope with observations of M12, depending on the aperture of the telescope (D), is about 0.4D-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 M12 is June.
For observers in the northern and middle latitudes:
The nights in June are very light, so try to observe M12 also in May and in July.
Of course, these months are also not very dark, in addition the object is at midnight not at its highest point, which
provides the least exposure and atmospheric distortion, but the sense is still there.
The farther south the location of your observatory is located, the darker the sky will be
or tell your friends: