Messier 103

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NGC 581
Observation data (J2000.0 epoch)
Right ascension 01h 33.2m
Declination +60° 42′
Distance 8.5 kly ()
Apparent magnitude (V) 7.4
Apparent dimensions (V) 6.0'
Other designations M103
See also: Open cluster, List of open clusters

Messier 103 (also known as M103, or NGC 581) is an open cluster in the constellation Cassiopeia. It was discovered by Pierre Méchain in 1781[citation needed]. M103 is at a distance of about 8,000 light-years from Earth[citation needed].

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