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The low-latitude globular clusters Terzan 10 and Djorgovski 1 are vprojectedin the Galactic bulge, in a Galactic region highly affected by extinction. Adiscrepancy of a factor of ~2 exists in the literature in regards to thedistance determination of these clusters. We revisit the colour-magnitudediagrams (CMDs) of these two globular clusters with the purpose ofdisentangling their distance determination ambiguity and, for the first time,of determining their orbits to identify whether or not they are part of thebulge/bar region. We use Hubble Space Telescope CMDs, with the filters F606Wfrom ACS and F160W from WFC3 for Terzan 10, and F606W and F814W from ACS forDjorgosvski~1, and combine them with the proper motions from Gaia Date Release2. For the orbit integrations, we employed a steady Galactic model with bar.For the first time the blue horizontal branch of these clusters is clearlyresolved. We obtain reliable distances of dSun = 10.3+-1.0 kpc and 9.3+-0.5 kpcfor Terzan 10, and Djorgovski 1 respectively, indicating that they are bothcurrently located in the bulge volume. From Gaia DR 2 proper motions, togetherwith our new distance determination and recent literature radial velocities, weare able to show that the two sample clusters have typical halo orbits that arepassing by the bulge/bar region, but that they are not part of this component.For the first time, halo intruders are identified in the bulge.

Halo intruders in the Galactic bulge revealed by HST and Gaia: the globular clusters Terzan 10 and Djorgovski 1