Magellan spacecraft reaches Venus 1990

The Magellan spacecraft (Venus Radar Mapper), launched May 4, 1989 from the Space Shuttle Atlantis, reached its objective August 10, 1990.  It collected radar imaging of 98% of the Venusian surface at a resolution of about 100m.  It also measured the gravitational field to investigate to show the planet’s internal mass distribution.  Its mission came to an end October 13, 1994, when it entered the Venusian atmosphere.  It was expected to vaporize on its descent but scientists think that some of the spacecraft survived.

http://www2.jpl.nasa.gov/magellan/fact.html