M103 (also known as NGC 581) is a relatively small open star cluster in the constellation Cassiopeia.
The bright star at the right of the image is Delta Cassiopeia.
It lies at a distance of about (estimated) 9.500 light years and is one of the most distant open clusters.
The age of this cluster is about 25 million years.
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Object info
| Name | M103 |
| Type | Open cluster |
| Constellation | Cassiopeia |
| Right ascension | 01h 33m 12s |
| Declination | +60° 42′ 00″ |
| Distance | 9.500 ly |
| Other designations | NGC581 |
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