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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):
Visual magnitude: 6,7m
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.
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