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Ham the chimpanzee flew to space before any US astronaut

On this day · 31 January 1961
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Ham the chimpanzee flew to space before any US astronaut

On January 31, 1961, a 37-pound chimp pulled levers through a 16.5-minute suborbital flight that went badly off-plan, clearing the way for Alan Shepard.

Verified · Smithsonian National Air and Space Museum

Ham, a chimpanzee trained by the U.S. Air Force, became the first chimpanzee in space on January 31, 1961, riding a Mercury-Redstone 2 rocket on a 16.5-minute suborbital flight more than three months before Alan Shepard became the first American in space.

The flight was suborbital, not orbital. Ham is often described as having orbited Earth, and even the National Archives captions his photo “After Orbiting the Earth.” He did not. His capsule flew a ballistic arc out over the Atlantic and back down. The first American chimpanzee to reach orbit was Enos, in November 1961, ahead of John Glenn’s orbital flight.

Ham was there to work, not just ride. Born in 1957 in French Cameroon, he was one of 40 chimps chosen for the program and trained at Holloman Air Force Base to pull levers in response to lights and sounds: a correct response within five seconds earned a banana pellet, and a miss brought a mild shock to the soles of his feet. In flight his reaction times were only slightly slower than on the ground, evidence that an astronaut could still operate controls.

The mission nearly killed him. Technical problems sent the capsule to 157 miles at 5,857 mph, well beyond the planned 115 miles and 4,400 mph, and it came down 422 miles downrange instead of 290. The cabin partly lost pressure, and only the sealed, pressurized capsule encasing him averted disaster. After splashdown, water flooded in; had the helicopter arrived later, he might have drowned. He shook hands with the recovery ship’s commander and took an apple, but later, agitated by flashbulbs and crowding newsmen, snapped at several people.

Ham lived at the Smithsonian’s National Zoo until 1980, then at the North Carolina Zoo. He died in 1983, and his remains were buried at the International Space Hall of Fame in Alamogordo, New Mexico.

157 mi
peak altitude
16.5 min
flight time
6.6 min
weightless

Sources & references

5 references

Well-established. Corroborated by 3 independent sources.

1 Smithsonian National Air and Space Museum Museum / research institution However, due to technical problems, the spacecraft carrying Ham reached an altitude of 157 miles and a speed of 5,857 mph and landed 422 miles downrange rather than the anticipated 290 miles… He experienced a total of 6.6 minutes of weightlessness during a 16.5-minute flight. airandspace.si.edu ↗
2 Smithsonian National Air and Space Museum Museum / research institution The chimps were taught to pull levers in response to sound and light. If they reacted correctly within five seconds, they were rewarded with banana pellets; if not, they got a mild shock on the soles of their feet. airandspace.si.edu ↗
3 Smithsonian National Air and Space Museum Museum / research institution He lived at the Smithsonian’s National Zoo in Washington, DC until 1980, when he was transferred to the North Carolina Zoological Park in Asheboro. When he died in 1983, Ham's skeleton went to the Armed Forces Institute of Pathology for further investigation. airandspace.si.edu ↗
4 NASA Space agency On January 31, 1961, Ham, whose name was an acronym for H olloman A ero M ed, became the first chimpanzee in space, aboard the Mercury Redstone rocket on a sub-orbital flight very similar to Alan Shepard’s. nasa.gov ↗
5 U.S. National Archives government More than just a passive rider, Ham readily performed a series of learned tasks on his journey proving that humans would have at least a limited functional capability in space. archives.gov ↗
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