Messier 103
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| Observation data: J2000.0 epoch | |
|---|---|
| Class: | d |
| Constellation: | |
| Right ascension: | 01h 33.2m |
| Declination: | +60° 42′ |
| Distance: | 8.5 kly () |
| Apparent magnitude (V): | 7.4 |
| Apparent dimensions (V): | 6.0″ |
| Physical characteristics | |
| Mass: | (- M☉) |
| Radius: | |
| VHB: | - |
| Estimated age: | |
| Notable features: | |
| 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 away from Earth[citation needed].
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