Messier 103
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| NGC 581 | |
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| 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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