Celestial hemisphere:  Northern  ·  Constellation: Cassiopeia (Cas)  ·  Contains:  M 103  ·  NGC 581
M103, Jirair Afarian
M103
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M103

M103, Jirair Afarian
M103
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M103

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Description

Messier 103 (also known as M103, or NGC 581) is an open cluster located in the constellation Cassiopeia and is relatively young at 25 million years old. This open cluster was discovered in 1781 by Charles Messier's friend and collaborator Pierre Méchain. It is one of the most distant open clusters known, with distances of 8,000 to 9,500 light-years from the earth and ranging about 15 light-years apart. There are about 40 member stars within M103, two of which have magnitudes 10.5, and a 10.8 red giant, which is the brightest within the cluster. Observation of M103 is generally dominated by the appearance of Struve 131, though the star is not a member of the 172-star cluster.

-From Wikipedia

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    M103, Jirair Afarian
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M103, Jirair Afarian

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