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By exploiting two sets of high-resolution images obtained with HST ACS/WFCover a baseline of ~10 years we have measured relative proper motions of~70,000 stars in the stellar system Terzan 5. The results confirm themembership of the three sub-populations with different iron abudancesdiscovered in the system. The orbit of the system has been derived from a firstestimate of its absolute proper motion, obtained by using bulge stars asreference. The results of the integration of this orbit within an axisymmetricGalactic model exclude any external accretion origin for this cluster. Terzan 5is known to have chemistry similar to the Galactic bulge; our findings supporta kinematic link between the cluster and the bulge, further strengthening thepossibility that Terzan 5 is the fossil remnant of one of the pristine clumpsthat originated the bulge.

Proper motions in Terzan 5: membership of the multi-iron sub-populations and first constrain to the orbit