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Mass of Open Cluster NGC 7789

Mass of open cluster NGC 7789 in the Galaxy is determined by three methods: the photometric method based on mass-luminosity relations of stars in the cluster Mpho = 7712.5M⊙; the dynamical method based on virial theorem Mvir = 6996.1M⊙; and the tidal radius method based on the interaction between the cluster and the Galaxy Mtid = 5152.5M⊙. The mean mass of this cluster is estimated to be Mc = 6620.4 ± 762.5M⊙.