Artemis II Crew Prepares for Splashdown After Record-Breaking Lunar Flyby Mission

Four astronauts are less than 24 hours from completing the most consequential American spaceflight in more than five decades, and how they land will matter as much as how far they flew.

Commander Reid Wiseman, Pilot Victor Glover, Mission Specialist Christina Koch, and Mission Specialist Jeremy Hansen of the Canadian Space Agency are preparing for reentry and splashdown Friday evening, closing out a 10-day Artemis II mission that broke humanity's distance record for human spaceflight and ended a 52-year absence from beyond Earth orbit. The crew has been stowing gear and completing final on-board tests aboard Orion, which they nicknamed "Integrity" after launching from Kennedy Space Center's Launch Complex 39B on April 1.

The distance record fell on April 6, when Orion reached approximately 252,756 miles from Earth during a seven-hour lunar flyby, surpassing the Apollo 13 crew's 1970 mark of 248,655 miles by roughly 4,100 miles. The flyby brought the spacecraft within 4,067 miles of the Moon's surface, granting the crew unobstructed views of the lunar far side that no human being had seen directly before. For roughly 40 minutes during that passage, as Orion disappeared behind the Moon, all contact with flight controllers at NASA's Johnson Space Center in Houston was severed, one of the longest communications blackouts in crewed spaceflight history. That blackout provided a live test of whether Orion's systems could operate autonomously through a complete loss of ground communication, a baseline requirement for any crewed lunar landing.

Friday's reentry sequence begins with module separation at 7:33 p.m. ET, when the crew module detaches from the service module. Splashdown is targeted for 8:07 p.m. EDT (5:07 p.m. PDT) in the Pacific Ocean, roughly 60 miles off the coast of San Diego. Between those two moments lies the mission's most dangerous phase.

Orion will hit Earth's atmosphere at approximately 34,965 feet per second, about 23,840 mph. The AVCOAT heat shield, the largest ablative heat shield ever built for a crewed spacecraft, will face exterior temperatures reaching 3,000 degrees Fahrenheit. A plasma sheath will form around the capsule, causing another brief communications blackout during descent. NASA modified the reentry flight profile from the originally planned skip reentry to a steeper entry path after heat-shield erosion was observed on the uncrewed Artemis I test flight, a change that alters the structural and thermal stress profile on both the shield and the crew. A sequence of 11 parachutes will then deploy to slow the capsule from hypersonic speed to approximately 17 mph at splashdown.

Recovery operations will be led by the USS John P. Murtha (LPD 26), a San Diego-based Navy amphibious transport dock ship commanded by Capt. Erik Kenny, who described the recovery mission as "a fitting tribute" to the ship's namesake, Pennsylvania Congressman John P. Murtha. The ship departed Naval Base San Diego on April 7. MH-60 Seahawk helicopters from Helicopter Sea Combat Squadron at Naval Air Station North Island will retrieve the crew from the water and transport them aboard for post-mission medical evaluations before the team travels to Johnson Space Center in Houston.

Those medical evaluations, combined with heat shield performance data from the modified reentry profile, represent the critical deliverables NASA needs before finalizing Artemis III. If the AVCOAT shield held under the steeper entry conditions, the agency can proceed toward its crewed lunar landing without scheduling an additional uncrewed test flight. If it didn't, that calculus changes, and so do the costs that follow.