We report the results about the internal dynamics of the rich galaxy cluster
ABGC209 on the basis of new spectroscopic and photometric data. ABCG209 is a peak of 112 detected member galaxies at z= 0:209, characterised by a high value of the line–of–sight velocity dispersion, 3⁄4v » 1400 km s¡1. The cluster shows evidence of relevant substructure and dynamical segregation, and is characterised by a preferential SE–NW direction. The observational scenario suggests that ABCG209 is a strongly evolving cluster, possibly in an advanced phase of merging.
