Abstract
The group of mostly faint galaxies surrounding the dumbbell galaxy NGC 4782/3 is examined. Assuming that the group mass is negligible compared to the dumbbell galaxy, an orbit-independent estimate for an upper limit of the mass of the galaxies is obtained using the virial theorem. Spectroscopic observations of 13 galaxies in the group suggest that the group has mass values in the range (1.8-6) X 10 to the 13th/h solar mass. If mass is distributed as luminosity, the dumbbell galaxy has a total mass in the range (0.8-3) X 10 to the 13th/h solar mass. 21 refs.
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