Gemini 9A

Gemini 9A was a pivotal mission in NASA's Gemini program, flown in June 1966. The flight, crewed by command pilot Thomas P. Stafford and pilot Eugene Cernan, was notable for its ambitious rendezvous objectives and a challenging, nearly catastrophic extra-vehicular activity. Originally designated Gemini 9, the mission was renamed following the tragic deaths of its prime crew in the 1966 NASA T-38 crash.

Mission background

The mission was originally assigned to astronauts Elliot See and Charles Bassett. However, both were killed on February 28, 1966, when their Northrop T-38 Talon crashed at McDonnell Aircraft's plant in St. Louis, Missouri. The backup crew, Stafford and Cernan, were subsequently promoted to the prime crew. The mission's target vehicle, an Augmented Target Docking Adapter (ATDA), was launched on an Atlas-Agena rocket on June 1, 1966. The initial launch attempt of the Gemini spacecraft on May 17 was scrubbed due to a failure of the Atlas-Agena target vehicle to achieve orbit, necessitating a rapid turnaround and the use of the backup ATDA.

Mission objectives

Primary objectives included a complex rendezvous with the ATDA in multiple orbital configurations, simulating techniques needed for Apollo program lunar missions. A critical goal was to practice docking, though the ATDA's shroud failed to fully separate, preventing this. The flight plan also included an extensive, ambitious United States spacewalk by Cernan, intended to test the Astronaut Maneuvering Unit and practice extravehicular work procedures. Additional objectives involved numerous scientific experiments, orbital photography, and precision re-entry and landing.

Flight summary

Launched from Cape Canaveral Launch Complex 19 on June 3, 1966, atop a Titan II GLV rocket, Stafford and Cernan successfully entered low Earth orbit. They performed a series of rendezvous maneuvers, closing to within inches of the ATDA. Upon arrival, the crew discovered the docking target's nose shroud had only partially jettisoned, resembling, as Stafford reported, an "angry alligator." This prevented a physical docking, but the crew expertly executed all planned proximity operations. The mission also conducted several experiments, including UV Astronomical Camera photography and Synoptic Terrain Photography.

Spacewalk difficulties

On June 5, Cernan began what was planned to be a two-hour EVA. Exiting the spacecraft, he immediately encountered severe difficulties. His space suit lacked adequate thermal control and mobility, leading to rapid overheating and fogging of his visor. The lack of handholds and the physical exertion required caused his heart rate to soar. His attempt to don and test the Astronaut Maneuvering Unit was hampered by these issues and by cumbersome umbilicals. After struggling for 128 minutes, a fatigued and overheated Cernan was ordered back inside the Gemini spacecraft by Stafford, having accomplished only a fraction of his tasks. The experience revealed critical flaws in EVA planning and hardware.

Aftermath and legacy

Despite the docking and EVA setbacks, the mission was deemed a "successful failure" that provided invaluable lessons. The rendezvous exercises proved the techniques for orbital meeting, crucial for Apollo. The harrowing EVA led to major redesigns of space suit cooling systems, the addition of astronaut handrails on future spacecraft like the Apollo Lunar Module, and a more gradual, task-oriented approach to extravehicular activity. The data directly informed the successful Gemini 10, Gemini 11, and Gemini 12 missions. Both Stafford and Cernan would go on to fly pivotal missions in the Apollo program, with Stafford commanding Apollo 10 and Cernan serving as the lunar module pilot on Apollo 10 and the commander of Apollo 17.

Category:Gemini program Category:1966 in spaceflight Category:Human spaceflights