Descriptions, Images, and Charts
M103 is a beautiful open cluster located in Cassiopeia. It is just beyond visual view but is wonderful in binoculars and seems to have a pronounced sense of depth. There is considerable contrast both in magnitude and color in the stars in M103, which somewhat small size makes it ideal for 50–100 power in a 3” or bigger telescope. In some ways it resembles a wedge of cheese. Its triangular shape is one of its distinguishing characteristics. The Sun probably formed in a cluster similar to M103, which has now all but completely dispersed, as M103 surely will disappear in the next several billion years.