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.
|Right ascension||01h 33m 12s|
|Declination||+60° 42′ 00″|