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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):
Ra 01h33.2m, Dec +60° 42'

Visual magnitude: 7,0m
Distance from the star clusters M103 to the Sun is 7150 light years
Angular size: 6'
Class: d
External dimensions the star clusters M103 are about 17 light years.
Number of stars: 77
Age of the object M103 is 16—25x106 years

Discoverer: Pierre François André Méchain, 1781 year.

The designation M103 in other catalogs: NGC 581

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.
The best month for observing M103 is October.

Nikolay Kurdyapin, astro-map.com  
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