Mission Duration at a Glance
Apollo 13 lasted approximately 5 days, 22 hours, 54 minutes, and 41 seconds, from launch on April 11, 1970, to splashdown on April 17, 1970. It was intended as a lunar landing mission, but an oxygen tank explosion on April 13 forced a circumlunar flyby and a safe return to Earth. The following facts are drawn from NASA official records and mission transcripts.
Launch and Initial Trajectory
Launch Vehicle and Pad
Apollo 13 launched atop a Saturn V rocket from Kennedy Space Center Launch Complex 39A. The mission aimed to land in the Fra Mauro highlands, but the explosion on April 13 redefined objectives to a safe return.
Outbound Coast to the Moon
After transposition and docking with the Lunar Module Aquarius, the crew performed a trans-Earth injection test. The explosion occurred about 55 hours into the flight, disabling the Service Module Odyssey and forcing use of the Lunar Module Aquarius as a lifeboat.
Key Mission Phases and Timings
| Event | Mission Elapsed Time | Notes |
|---|---|---|
| Launch | T+00:00:00 | April 11, 1970, 19:13:52 UTC | Explosion (Odyssey) | T+01:07:53 | April 13, 1970, about 200,000 miles from Earth |
| Lunar flyby | T+54:00:00 (approx.) | Apoapsis reached beyond the Moon at ~254,000 miles |
| Reentry and splashdown | T+142:54:41 | April 17, 1970, 18:07:41 UTC in the Pacific |
Critical Decision Points
After the explosion, the crew powered down Odyssey to conserve resources. Mission Control designed a plan to use the Lunar Module as a shelter and to burn the Service Module engine for a precise return trajectory. Midcourse correction burns and a fiery reentry corridor were carefully calculated to ensure splashdown in the target zone.
Splashdown and Recovery
Recovery ship USS Iwo Jima recovered the crew. The mission demonstrated the robustness of Apollo spacecraft life support and the ingenuity of ground teams to bring a crew home safely despite catastrophic failure.
Legacy and Mission Comparisons
Apollo 13 remains a benchmark in problem-solving and contingency planning. It’s the only crewed mission to a malfunction en route to the Moon that did not land but returned safely. The duration placed it among the shorter Apollo flights, but the operational complexity was among the highest ever managed.