The Pioneer Venus Spacecraft Program

The Pioneer Venus Program consists of two spacecraft: an Orbiter and a Multiprobe. Both spacecraft will arrive at Venus in early December, 1978. The Orbiter will collect data on the upper atmosphere and fields and particles and will remotely sense the clouds and surface from a 75 deg inclined orbit. The Multiprobe consists of a Bus, three Small Probes, and a Large Probe. All five objects will enter the Venus atmosphere and will transmit data on its characteristics directly back to earth while descending to the surface. The entire mission is expected to substantially increase our knowledge of the planet Venus, especially its atmosphere.