Reimar Lüst and Pierre Lacroûte
Reimar Lüst (left) and Pierre Lacroûte (right) at the International Hipparcos Press Conference, 11 April 1988.
At the press conference, Reimar Lüst received the Hipparcos Input Catalogue on behalf of ESA, in the presence of members of the Hipparcos science community and ESA Hipparcos team members. The Hipparcos Input Catalogue formed the mission's observing programme: it contained over 100 000 target stars that Hipparcos would monitor to obtain their astrometric properties.
Reimar Lüst served as the ESA Director General from 1984 to 1990. Pierre Lacroûte was a pioneer of space astrometry, first proposing a space astrometry mission in 1967; this became the Hipparcos mission.