Launch date and mission basics
Artemis 2 launched on 16 November 2022 from Kennedy Space Center in Florida. It was the first crewed flight test of NASA’s Orion spacecraft and the Space Launch System rocket, sending astronauts on a distant retrograde orbit around the Moon before returning to Earth. The mission established a framework for later Artemis lunar surface missions.
Time to reach low Earth orbit (LEO)
By standard NASA and industry definitions, a mission reaches space when it attains orbit. Artemis 2 reached low Earth orbit approximately 8 minutes and 24 seconds after liftoff. This marks the end of the initial ascent phase and the beginning of the orbital phase of flight.
First-stage separation and second-stage ignition
About 8 minutes into flight, the solid rocket boosters and core stage completed their burn and separated. The core stage impacted the ocean as planned, while the upper stage—powered by a single RL10 engine—initiated multiple burns to circularize orbit and later send Orion toward the Moon.
Time to reach the Moon and TLI
After completing phasing orbits and checking systems, Artemis 2 performed a trans-lunar injection (TLI) burn. TLI occurred roughly 1 hour and 20 minutes after the first LEO insertion, setting Orion on a trajectory toward the Moon. The spacecraft completed a free-return trajectory that ensured a safe return path in case of an anomaly.
Key mission milestones summary
| Milestone | Approximate elapsed time from launch | Why it matters |
|---|---|---|
| Solid boosters and core stage separation | ≈2 minutes 50 seconds | Completes first-stage burn |
| Second-stage cutoff and payload fairing jettison | ≈6 to 7 minutes | Enables Orion to continue ascent |
| Reach low Earth orbit (LEO) | ≈8 minutes 24 seconds | Official entry into space, orbit established |
| Orbital maintenance and phasing | ≈30 to 90 minutes in LEO | Checks systems and aligns for TLI |
| Trans-lunar injection (TLI) | ≈1 to 1.5 hours after LEO | Sets course for the Moon |
| Lunar arrival (approach) | ≈1 to 2 days | Orbit insertion around the Moon |
Full mission timeline overview
From launch to splashdown, Artemis 2 lasted about 25 days. The first several hours were dedicated to reaching orbit, checking Orion’s systems, and departing for the Moon. The cruise phase included trajectory corrections, scientific instrument checks, and crew evaluations. Upon returning, the spacecraft reentered Earth’s atmosphere at high speed and splashed down safely in the Pacific Ocean.
Defining when a mission reaches space
There are two commonly referenced thresholds for reaching space: the Kármán line at 100 kilometers and the U.S. threshold at 80 kilometers. Artemis 2 crossed both. The mission’s official recognition as having reached space is tied to achieving stable orbit, which occurred under 10 minutes after liftoff.
Comparison with earlier crewed missions
Relative to Space Shuttle missions that reached orbit in about 8 minutes, Artemis 2 followed a similar ascent profile but with modern avionics and a different orbital target. Compared to Apollo missions, which took roughly 11 minutes to reach Earth orbit and multiple hours to trans-lunar injection, Artemis 2 optimized timelines while maintaining rigorous safety checks.
Common misconceptions
- Artemis 2 did not go straight to the Moon; it first achieved orbit.
- Reaching space is defined by orbit, not merely by passing an altitude.
- The 8-to-9-hour timeframe to trans-lunar injection includes phasing and checkout, not just ascent.
Key sources and references
Major timelines and milestones are drawn from NASA Artemis 2 mission summaries, launch integration reports, and post-flight assessments. Independent analyses from partner agencies corroborate the ascent and TLI durations cited here.
Takeaway
Artemis 2 reached space—defined as stable orbit—within about 8 to 9 minutes of launch, and it reached the Moon’s vicinity within roughly 1 to 2 days. The mission demonstrated that the Orion spacecraft and SLS rocket can safely transport astronauts beyond low Earth orbit, paving the way for sustained lunar exploration.