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... М102 < М103 > М104 ...
Open star cluster M103
Open star cluster M103 is in the constellation Cassiopeia (Cas).
Equatorial coordinates (epoch J2000):
Visual magnitude: 7,0m
Optimum magnification for a telescope with observations of M103, depending on the aperture of the telescope (D), is about 20x. Higher magnifications of course add details, but lead to a strong drop in the brightness of the image, making it difficult to observe.
Nikolay Kurdyapin, astro-map.com
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