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

NGC 581
Observation data (J2000.0 epoch)
Right ascension01h 33.2m
Declination+60° 42′
Distance8.5 kly ()
Apparent magnitude (V)7.4
Apparent dimensions (V)6.0'
Other designationsM103

External links