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... М9 < М10 > М11 ...

Globular star cluster M10

Globular star cluster M10 is in the constellation Ophiuchus (Oph).


Equatorial coordinates (epoch J2000):
Ra 16h57.1m, Dec -04° 06'

Visual magnitude: 6,7m
Distance from the star clusters M10 to the Sun is 24750 light years
Angular size: 19'
Class: VII
External dimensions the star clusters M10 are about 140 light years.
Estimated weight the star clusters: 200x103 suns

Discoverer: Charles Messier, 1764 year.

The designation M10 in other catalogs: NGC 6254

Optimum magnification for a telescope with observations of M10, 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 M10 is June.
For observers in the northern and middle latitudes:The nights in June are very light, so try to observe M10 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, whichprovides 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

Nikolay Kurdyapin, astro-map.com  
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