TDRS-3

TDRS-3, also known as TDRS-C, was the third Tracking and Data Relay Satellite (TDRS) launched by NASA. Part of the first generation TDRS system, it played a crucial role in relaying data between low Earth orbit satellites, such as the Space Shuttle and the Hubble Space Telescope, and ground stations on Earth. This relay capability significantly reduced the need for a global network of ground stations and increased the amount of time these satellites could communicate with mission control.

Launched on September 29, 1988, aboard the Space Shuttle Discovery during mission STS-26, TDRS-3 was initially placed in a parking orbit. It then used its own propulsion system to reach its designated geostationary orbit.

The TDRS system, including TDRS-3, was designed to provide near-continuous communication coverage for spacecraft in low Earth orbit. It transmitted data, telemetry, and commands, enabling real-time monitoring and control of these missions.

After years of service exceeding its designed lifespan, TDRS-3 was eventually retired. Its functions were taken over by newer generation TDRS satellites with enhanced capabilities.