ngc 4103 is a young open cluster. its age has been determined to be 30 myr by sagar & cannon (1997), 20 ± 5 myr by sanner et al. (2001) and 6 myr by piskunov et al. (2004). the metallicity of ngc 4103 is subsolar (−0.47). the tidal radius of the cluster is 12.1 - 15.9 parsecs (39 - 51 light years) and represents the average outer limit of ngc 4103, beyond which a star is unlikely to remain gravitationally bound to the cluster core.