Descriptions, Images, and Charts

  • Charles A. CardonaIII
Part of the Astronomer's Pocket Field Guide book series (ASTROPOC)


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.


Open Cluster Globular Cluster Star Cluster Variable Star Bright Star 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  1. 1.CalvertonUSA

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