Engineering analysis confirms the Orion spacecraft's thermal protection system performed as expected during the Artemis II mission's reentry.

NASA has completed a comprehensive engineering analysis of the Orion spacecraft's heat shield following the Artemis II mission. The data confirms that the thermal protection system successfully safeguarded the crew and internal systems during the spacecraft's high-speed reentry into Earth's atmosphere.

Reentry Performance and Modifications

To improve performance over the Artemis I mission, NASA modified the reentry trajectory for Artemis II. By shortening the maximum downrange distance between atmospheric entry and splashdown, engineers limited the duration the heat shield spent in temperature ranges associated with material phenomena observed during the previous flight. This adjustment was informed by extensive arc jet material testing conducted at NASA’s Ames Research Center. During the return from the Moon, Orion reached a maximum velocity of 39 times the speed of sound, with external temperatures exceeding 4,000 degrees Fahrenheit. Despite these conditions, the cabin temperature remained in the mid-70s Fahrenheit. The spacecraft demonstrated high precision, entering within 192 feet of its targeted entry interface and splashing down 0.59 miles from the predicted site off the coast of San Diego.

Post-Mission Inspection Results

Initial inspections of the thermal protection system began shortly after the April 10, 2026, splashdown, utilizing underwater imagery captured by U.S. Navy divers. Further evaluations were conducted on the recovery ship and later at the Operations and Checkout Building at Kennedy Space Center in Florida. These inspections revealed a significant reduction in both the number of cracks and the amount of char loss on the Artemis II heat shield compared to the shield used during the Artemis I mission.