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The Pioneer 10 and 11 and Voyager 1 and 2 spacecraft, launched in the 1970s,are heading out of the solar system. Using the astrometric and radial velocitydata from the second Gaia data release, we integrate the trajectories of 7.4million stars, and the spacecraft, through a Galactic potential in order toidentify those stars the spacecraft will pass closest to. The closestencounters for all spacecraft take place at separations between 0.2 and 0.5 pcwithin the next million years. The closest encounter will be by Pioneer 10 withthe K8 dwarf HIP 117795, at 0.23 pc in 90 kyr at a high relative velocity of291 km/s.

Future stellar flybys of the Voyager and Pioneer spacecraft