On July 20, 1969, Apollo 11 placed the first humans on the Moon, but the mission carried three astronauts. While Neil Armstrong and Buzz Aldrin descended in the Lunar Module, Michael Collins remained in orbit around the Moon aboard Command Module Columbia.
This article details the role of the third astronaut on Apollo 11, highlighting responsibilities, experiences, and the significance of staying in lunar orbit.
| Astronaut | Role | Vehicle | Key Responsibility |
|---|---|---|---|
| Neil Armstrong | Mission Commander | Lunar Module Eagle | First human to walk on the Moon |
| Buzz Aldrin | Lunar Module Pilot | Lunar Module Eagle | Second human on the Moon, conducted experiments |
| Michael Collins | Command Module Pilot | Command Module Columbia | Remained in orbit, maintained communications and guidance |
Role of the Command Module Pilot
Orbital Operations and Communication
Michael Collins, as Command Module Pilot for Apollo 11, managed the critical systems of Columbia while Armstrong and Aldrin explored the lunar surface. His main tasks included maintaining the correct lunar orbit, monitoring spacecraft systems, and serving as the primary communication relay between the landing crew and Mission Control.
Isolation and Vigilance
Collins orbited the Moon alone for approximately 48 minutes in each orbit, experiencing up to 45 minutes of communications blackout during each pass. During these isolated periods, he remained vigilant, performing tracking burns and ensuring Columbia remained in a stable orbit for the crew’s return.
Lunar Orbit Science and Observations
Mapping and Photography
While descending toward the Moon, Collins carefully aligned orbital parameters to support surface operations. He conducted photographic surveys of potential future landing sites and monitored the trajectory of surface activities using onboard mapping tools.
Scientific Experiments
Collins operated scientific instruments in lunar orbit, including a star tracker and a camera designed to study Earth and the Moon. These observations contributed to navigation accuracy and helped refine models of the Earth–Moon system.
Navigation and Rendezvous Planning
Orbit Determination and Adjustments
Collins performed precise trajectory corrections to ensure that Columbia remained within tight tolerances for rendezvous. He calculated burn durations and timing so that Armstrong and Aldrin could lift off and dock safely with the command module.
Redundancy and Contingency Procedures
Trained for multiple failure scenarios, Collins practiced emergency ascent and rendezvous procedures. His work guaranteed that, if the Lunar Module failed to reach orbit, Columbia could still attempt a safe return using powered flight paths he carefully calculated.
Life Support and Systems Management
Environmental Control and Power Monitoring
Collins managed the environmental systems of Columbia, including oxygen supply, carbon dioxide removal, and electrical power distribution. These functions were essential to maintain crew safety during the solo orbital phase of the mission.
Food, Hygiene, and Crew Welfare
He handled food preparation and personal hygiene procedures in microgravity, ensuring that Armstrong and Aldrin remained healthy and focused for their lunar activities. Collins’s attention to life support directly contributed to stable conditions inside the command module.
Key Takeaways for Mission Operations
- Command Module Pilots manage spacecraft systems during lunar surface operations.
- Lunar orbit operations involve periodic isolation and precise navigation burns.
- Communication relays and contingency planning are critical for crew safety.
- Scientific observations from orbit support future landing site selection.
- Life support management in the command module ensures crew stability throughout the mission.
FAQ
Reader questions
What did Michael Collins do while Armstrong and Aldrin walked on the Moon?
Michael Collins remained in lunar orbit aboard Command Module Columbia, managing navigation, communications, and spacecraft systems while monitoring the landing and preparing for rendezvous.
How long was Collins alone in lunar orbit during Apollo 11?
Collins orbited the Moon alone for about 48 minutes during each orbit, with up to 45 minutes of communications blackout, repeating this pattern for much of the mission’s orbital phase.
Why was the command module pilot essential for mission success?
The command module pilot ensured orbital stability, maintained reliable communication, and provided a safe return path, making the lunar landing and crew recovery possible.
Did Michael Collins perform any scientific experiments while orbiting?
Yes, Collins operated cameras and scientific sensors to map potential landing sites and study the Earth–Moon system, adding valuable data to the mission objectives.