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We present the results of an extensive spectroscopic survey of RX J0152.7-1357, one of the most massive distant\udclusters of galaxies known. Multi-object spectroscopy, carried out with FORS1 and FORS2 on the ESO Very Large\udTelescope (VLT), has allowed us to measure more than 200 redshifts in the cluster field and to confirm 102 galaxies as cluster\udmembers. The mean redshift of the cluster is z = 0.837 ± 0.001 and we estimate the velocity dispersion of the overall cluster\udgalaxy distribution to be ∼1600 km s−1. The distribution of cluster members is clearly irregular, with two main clumps that\udfollow the X-ray cluster emission mapped by Chandra. A third clump of galaxies to the east of the central structure and at the\udcluster redshift has also been identified. The two main clumps have velocity dispersions of ∼919 and ∼737 km s−1 respectively,\udand the peculiar velocity of the two clumps suggests that they will merge into a single more massive cluster. A segregation in\udthe star formation activity of the member galaxies is observed. All star-forming galaxies are located outside the high-density\udpeaks, which are populated only by passive galaxies. A population of red galaxies (belonging to the cluster red sequence) with\udclear post-starburst spectral features and [OII] (λ3727) emission lines is observed in the outskirts of the cluster. Two AGNs,\udwhich were previously confused with the diffuse X-ray emission from the intracluster medium in ROSAT and BeppoSAX observations,\udare found to be cluster members

A VLT spectroscopic survey of RX J0152.7-1357, a forming cluster of galaxies atz= 0.837