Reference

Shuttle Payloads and Related Information - Interplanetary Explorer Missions
 
› STS-30
Atlantis, May 4-8, 1989. Magellan/Venus radar mapper attached to Inertial Upper Stage booster deployed on quest to complete radar mapping of Earth's nearest neighbor.

› STS-34
Atlantis, Oct. 18-23, 1989. Galileo/Jupiter spacecraft, attached to Inertial Upper Stage booster, deployed on trajectory toward Jupiter.

› STS-41
Discovery, Oct. 6-10, 1990. European Space Agency-sponsored Ulysses spacecraft deployed, attach to two upper stages, Inertial Upper Stage and Payload Assist-Module-S boosters, on mission to explore polar regions of sun.