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Skylab 4

Skylab 4 (also SL-4 and SLM-3) was the fourth Skylab mission and placed the third and final crew on board the space station. The mission started November 16, 1973 with the launch of three astronauts on a Saturn IB rocket, and lasted 84 days, 1 hour and 16 minutes. A total of 6,051 astronaut-utilization hours were tallied by Skylab 4 astronauts performing scientific experiments in the areas of medical activities, solar observations, Earth resources, observation of the Comet Kohoutek and other experiments.

The manned Skylab missions were officially designated Skylab 2, 3, and 4. However, a series of mistakes during the design phase of the mission patches resulted in the patches reading Skylab I, Skylab II, and Skylab 3 respectively.