  We suggest that the kinematics and properties of interstellar object A/2017
U1 point towards its formation in a protoplanetary disk in the ~45 Myr-old
Carina or Columba young stellar associations, and subsequent ejection with a
low peculiar velocity (1-2 km/sec) during or soon after planet formation inside
the ice line. This scenario predicts that the Solar System will encounter more
such objects with radiants similar to that of A/2017 U1.

Earth and Planetary Astrophysics