NASA’s Artemis I Mission Begins Departure from Lunar Orbit

TL;DR

NASA’s Artemis I began departing lunar orbit with a distant retrograde orbit departure burn that committed the uncrewed Orion spacecraft to its journey back to Earth. The burn fired the European service module’s main engine for about one minute and 45 seconds, setting up a return powered lunar flyby, atmospheric re-entry, and the planned December 11 splashdown. Read on for the mission timeline, orbit details, distance record, and radiation challenges.

Transcript

[Applause] thank you [Applause] [Applause] foreign thank you foreign and we are live inside the white flight control room at the Johnson Space Center here in Houston Texas we are bringing you live coverage today of the distant retrograde orbit departure burn this is a quick burn expected to fire for one minute and 45 seconds beginning at 3 53 and 5... Read More

Key Insights

• 🛫 The Artemis 1 mission completed the distant retrograde orbit departure burn, a crucial step in its journey back to Earth.
• 🧑‍🚀 Being further from Earth exposes astronauts to increased radiation, requiring monitoring and protective measures.
• 👾 The three sources of space radiation are Galactic cosmic rays, trapped radiation in Van Allen belts, and solar particle events.
• 😤 The operational team is constantly working to improve radiation detectors and develop effective protection strategies.
• 😫 The distance record set by Orion during the mission highlights the spacecraft's capabilities for deep space exploration.
• 👨‍🚀 The Artemis missions aim to expand our knowledge of space radiation and develop strategies to protect astronauts during long-duration missions.
• 👨‍🚀 Space radiation poses challenges for astronauts on future Artemis missions, necessitating new research and countermeasures.

Questions & Answers

Q: Why did Artemis I perform the distant retrograde orbit departure burn?

The burn took Orion out of its distant retrograde orbit around the Moon and committed the spacecraft to returning toward Earth. It also prepared Orion for a return powered lunar flyby that would fine-tune its path toward the atmosphere.

Q: How long was the distant retrograde orbit departure burn?

The burn was expected to last one minute and 45 seconds. It used the large main engine on Orion’s European service module.

Q: What is the distant retrograde orbit used by Artemis I?

It is an elliptical, or oval-shaped, orbit around the Moon. The orbit was unique to Artemis I for testing the spacecraft’s systems and will not be used on future Artemis missions.

Q: What happened before Orion entered the distant retrograde orbit?

Orion performed an outbound powered flyby burn on November 21, when it was 81 miles above the lunar surface. A second maneuver, the distant retrograde orbit insertion burn, followed on November 25.

Q: How far from Earth did Orion travel during Artemis I?

Orion reached its maximum distance from Earth on November 28, flight day 13. At that point, the spacecraft was 268,563 miles from Earth.

Q: What steps followed Orion’s departure from lunar orbit?

The departure burn prepared Orion for a second lunar flyby called the return powered flyby. That maneuver would fine-tune the spacecraft’s path for atmospheric re-entry and the planned December 11 splashdown.

Q: How long was the Artemis I mission when the departure burn occurred?

The burn occurred on day 16 of the uncrewed mission. Artemis I was planned as a 25-and-a-half-day mission beyond the lunar surface.

Q: Why is space radiation important for future Artemis missions?

NASA treats astronauts as radiation workers because space radiation is a health hazard. The Space Radiation Element team develops and executes research to understand, characterize, and mitigate the health effects of the deep-space radiation environment.

Summary & Key Takeaways

• The Artemis 1 mission performed the distant retrograde orbit departure burn, which is necessary to leave the elliptical orbit around the Moon.

• The spacecraft reached a record distance from Earth, surpassing the previous record set by Apollo 13 during its mission.

• Future missions will face challenges due to the space radiation environment and will require protective measures to ensure astronaut safety.