to the naked eye, the cluster has several blue spectral type b type stars. the most luminous member is the ~2nd magnitude white-yellow supergiant mirfak, also known as alpha persei. bright members also include delta, sigma, psi, 29, 30, 34 and 48 persei. the hipparcos satellite and infrared color-magnitude diagram fitting show the cluster as about ~172 parsecs away from us.