Facts about Mercury-Atlas 9
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Gordon Cooper piloted Mercury-Atlas 9, making him the last American to fly solo in space on a dedicated single-astronaut mission.
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Sigma 7 completed 22 orbits around Earth over its nearly 34-hour mission, traveling approximately 576,000 miles and circling the planet more times than any previous American crewed spaceflight.
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Sigma 7 splashed down in the Pacific Ocean 4.7 miles from the recovery ship USS Kearsarge on May 16, 1963, marking the most accurate Mercury capsule landing to that point.
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Seven orbits of Mercury-Atlas 9 were completed by Schirra before he made the decision to end the mission early on May 16, 1963, citing deteriorating spacecraft systems and fuel conservation concerns.
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Sigma 7's heat shield successfully protected Schirra during reentry on May 16, 1963, withstanding temperatures exceeding 3,000 degrees Fahrenheit as the capsule descended through Earth's atmosphere.
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Schirra manually controlled the Sigma 7 spacecraft's reentry orientation on May 16, 1963, deliberately preserving fuel by disabling automatic systems during descent.
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In 1963, Mercury-Atlas 9 transmitted 5.6 million words of telemetry data back to Earth during its nearly 34-hour mission, setting a record for information volume from a crewed spaceflight.
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During Mercury-Atlas 9, Schirra's heart rate remained below 120 beats per minute throughout launch, demonstrating exceptional physiological control during spaceflight.
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The Sigma 7 spacecraft used on Mercury-Atlas 9 carried a chimpanzee named Enos on its previous orbital flight in November 1961 to test life support systems.
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Astronaut Wally Schirra commanded Mercury-Atlas 9 on May 15, 1963, completing nine orbits in nearly 34 hours, the longest Mercury mission to date.