The Apollo 13 mission launched on April 11, 1970, at 13:13 UTC from Kennedy Space Center in Florida. This third crewed lunar landing attempt became a dramatic demonstration of problem-solving in space after an oxygen tank explosion forced the crew to abort their Moon landing.
Designed as a Fra Mauro landing mission, Apollo 13 carried Commander Jim Lovell, Lunar Module Pilot Fred Haise, and Command Module Pilot Jack Swigert. The early phase of the flight appeared routine, but the in-flight emergency transformed it into one of NASA’s most celebrated survival stories.
Mission Launch Profile
| Mission | Launch Vehicle | Launch Site | Launch Time (UTC) | Lunar Orbit Insertion |
|---|---|---|---|---|
| Apollo 13 | Saturn V SA-508 | Kennedy Space Center, LC-39A | 11 April 1970, 13:13 | 11 April 1970, 20:54 |
| Orbital Period | Stages | Translunar Injection | Free Return Trajectory | Primary Objective |
| 169 minutes to parking orbit | S-IC first stage, S-II second stage, S-IVB third stage | 32:44 after liftoff | Used Moon’s gravity to return to Earth | Safely return crew after spacecraft failure |
Pre-Launch Planning and Crew Preparation
NASA engineers scheduled the launch for a precise planetary alignment to enable a direct translunar injection. The Saturn V rocket, one of the most powerful vehicles ever flown, had to perform flawlessly to send Apollo 13 toward the Moon.
Extensive simulations prepared the crew for nominal operations and contingency procedures. Training focused on systems knowledge, navigation, and rapid decision-making, which later proved essential when the oxygen tank failed en route to the Moon.
Launch Day Timeline
Key Phases from Liftoff to Translunar Injection
On April 11, 1970, the countdown reached zero at 13:13 UTC. The first stage burned for about two and a half minutes, followed by staging and second-stage ignition to continue the climb to orbit.
After achieving Earth orbit, the crew checked systems and restarted the S-IVB third stage for translunar injection. The spacecraft separated from the rocket, and the crew performed midcourse corrections to align the free return trajectory.
In-Flight Emergency
What Happened Two Days After Launch
On April 13, an oxygen tank in the Service Module exploded during a routine stir, crippling the spacecraft. Power, light, and water were lost, and the mission shifted from landing to survival.
Using the Lunar Module as a lifeboat, the crew conserved resources, adjusted their course with improvised navigation methods, and returned safely to Earth on April 17. The failure was traced to a damaged thermostat inside an oxygen tank.
Historical Impact and Lessons
Apollo 13 reshaped spacecraft design, emergency procedures, and mission control protocols. The emphasis on redundancy, real-time problem solving, and crew-centric engineering influenced every subsequent human spaceflight program.
The mission became a benchmark for contingency planning in complex systems, demonstrating how meticulous preparation can turn potential tragedy into a successful rescue.
Key Takeaways
- Apollo 13 launched on April 11, 1970, at 13:13 UTC from Cape Canaveral.
- The mission used a Saturn V rocket and targeted the Fra Mauro highlands for exploration.
- An oxygen tank explosion on April 13 forced the crew to rely on the Lunar Module as a lifeboat.
- Careful planning, rapid innovation, and precise navigation enabled a safe return to Earth on April 17.
- The lessons from Apollo 13 influenced spacecraft resilience, training, and mission control practices for decades.
FAQ
Reader questions
What was the exact launch date and time of Apollo 13 in UTC?
Apollo 13 launched on April 11, 1970, at 13:13 UTC from Kennedy Space Center’s Launch Complex 39A.
Which rocket launched Apollo 13 and what was its mission type?
The Saturn V SA-508 rocket launched Apollo 13 on a free return trajectory to the Moon after an aborted landing due to an oxygen tank explosion.
How long after liftoff did Apollo 13 reach Earth orbit?
The command and service module entered Earth orbit approximately 119 minutes after liftoff, following stage separations and second-stage burn.
When did the crew perform the critical course correction after the explosion?
Around 55 hours after launch, the crew burned the Lunar Module’s descent engine to refine the free return trajectory and ensure a safe return path.