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Abstract. Photoelectric observations in the Vilnius seven-color system of 78 stars with V < 11.5 mag in the Alpha Persei open cluster are presented. The photometric quantification of stars in terms of spectral class and absolute magnitude has been made and their individual reddening values determined. The mean reddening value of the cluster members is Εγ-ν -0.06 ± 0.03 mag (equivalent to Eß-V -0.07 ± 0.04 mag). By fitting the zero-age main sequences of the Alpha Persei and the Hyades clusters and taking into account the difference in their metallicities, the true distance modulus Vo ~ My -6-24 ± 0.06 mag (177 ± 5 pc) has been determined. The average value of individual distance moduli of 69 cluster members is found to be 6.28 ± 0.04 mag, which corresponds to 180 ± 3 pc distance. The absolute magnitude of the F5Ib supergiant a Per is found to be My = -4.7 mag.

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