Messier 103. NGC 581

Click on the image for a full resolution version   Messier 103 is a rather small and far away open cluster. It is located in the constellation Cassiopeia, close to the bright delta Cas (mag +2.81, eclipsing binary). This cluster has 172 confirmed stars, out of which, a prominent red giant star, of spectral type … Continue reading Messier 103. NGC 581