Gemini 8

Spacecraft· NASAinactive

Gemini 8 — the first docking of two spacecraft (March 1966). When a stuck thruster sent the joined craft tumbling, Neil Armstrong undocked and recovered control, saving the crew.

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Key facts

Distance from Sun

1.01 AU

Status

Completed

Launched

1966

Mission & specifications

Mission

Operator: NASA
Launched: March 16, 1966
Status: Completed

Trajectory

Distance from the Sun: 1.01 AU
Distance from Earth: 387,570 km
Distance from Venus: 0.646 AU

Mission

Gemini 8 achieved the first docking of two spacecraft in orbit — and then nearly killed its crew. Launched on 16 March 1966, Neil Armstrong and David Scott chased down an uncrewed Agena target vehicle and, after a flawless rendezvous, gently linked up with it — a manoeuvre essential to the Moon missions, where two craft would have to join in lunar orbit. The triumph lasted minutes. The docked vehicles began to roll, and when the crew undocked the spin grew violent: a Gemini thruster had stuck open. Tumbling about once a second, fast enough to risk blacking out and losing control entirely, Armstrong shut down the main manoeuvring system and used the separate re-entry control thrusters to stop the spin and steady the craft. It was a cool piece of flying under extreme pressure, but firing the re-entry system forced an immediate abort, and the mission ended after just eleven hours with an emergency splashdown in the Pacific. Armstrong's calm recovery from a life-threatening emergency was remembered three years later, when NASA chose him to command the first Moon landing.

1966Gemini 8 launchesLaunch
Armstrong and Scott set out to rendezvous and dock with an uncrewed Agena target.
1966The first docking in orbitMilestone
Gemini 8 links up with the Agena — the first docking of two spacecraft.
1966The tumbling emergencyMilestone
A stuck thruster sends the joined craft spinning; Armstrong undocks and uses the re-entry thrusters to stop the roll, saving the crew.
1966Emergency splashdownMission end
The recovery forces an immediate abort; the mission ends after about 11 hours.

Images

The Agena target vehicle seen from Gemini 8 before the first docking — NASA (public domain) · Wikimedia Commons

GEMINI-TITAN (GT)-8 - TRAINING - WATER EGRESS - COMMAND PILOT - GULF — NASA/JSC · NASA Image Library

GEMINI-TITAN (GT)-8 - RECOVERY - SPACECRAFT (S/C) HOISTED ABOARD - PACIFIC — NASA/JSC · NASA Image Library

Gemini 8 spacecraft hoisted aboard the U.S.S. Leonard F. Mason — NASA/JSC · NASA Image Library

GEMINI-TITAN (GT)-8 - PRELAUNCH ACTIVITY - CAPE — NASA/JSC · NASA Image Library

Gemini 8 safely afloat after the emergency splashdown, March 16, 1966 — NASA/JSC · NASA Image Library

Gemini 8 Recovery - Astronaut David R. Scott - Miscellaneous - Atlantic — NASA/JSC · NASA Image Library

LIFTOFF - GEMINI-TITAN (GT)-8 - ATLAS/AGENA - CAPE — NASA/JSC · NASA Image Library

Images from open archives · credit shown per image