The primary payload, a Magellan/Venus radar mapper spacecraft and attached Inertial Upper Stage (IUS), was deployed six hours, 14 minutes into flight. The IUS first and second stage fired as planned, boosting the Magellan spacecraft on a proper trajectory for a 15-month journey to Venus.
Secondary payloads were: Mesoscale Lightning Experiment (MLE), microgravity research with Fluids Experiment Apparatus (FEA), and Air Force Maui Optical Site (AMOS) experiment.
One of five General Purpose Computers (GPC) failed and had to be replaced with a sixth onboard hardware spare. This is the first time a GPC was switched on orbit.
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