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We report the first radial velocity measurements of the recently identifiedglobular cluster FSR1758. From the two member stars with radial velocities fromthe Gaia Radial Velocity Spectrograph reported in Gaia DR2, we find FSR1758 hasa radial velocity of $227\pm1$ km/s. We also find potential extra-tidal starlost from the cluster in the surrounding 1~deg. Combined with Gaia propermotions and photometric distance estimates, this shows that FSR1758 is on avery retrograde, radial orbit with an pericentre of $3.8_{-0.9}^{+0.9}$ kpc, anapocentre of $16_{-5}^{+8}$ kpc, and eccentricity of $0.62_{-0.04}^{+0.05}$.Although it is currently at a Galactocentric distance of $3.8_{-0.9}^{+0.9}$kpc --- at the edge of the bulge --- it is an intruder from the halo. Weinvestigate whether a reported `halo' of stars around FSR1758 is related to thecluster, and find that most of these stars are likely foreground dwarf stars.We conclude that FSR1758 is not a dwarf galaxy, but rather a globular cluster.

The retrograde orbit of the globular cluster FSR1758 revealed with Gaia DR2