Key Findings
Post-flight assessments of the Artemis II mission confirm that the Orion spacecraft’s thermal protection system (TPS) functioned according to engineering predictions. Most notably, the number of char loss spots on the heat shield dish was reduced to nine, compared to 103 observed during Artemis I. This represents a ten-fold reduction in char loss and cracking, validating the agency’s strategic trajectory modifications.
Technical Details
The heat shield consists of 186 unique blocks of Avcoat, an ablative material. During reentry, Orion reached a maximum velocity of 39 times the speed of sound, with external temperatures exceeding 4,000 degrees Fahrenheit; however, internal cabin temperatures remained in the mid-70 degree Fahrenheit range. The spacecraft entered within 192 feet of its targeted entry interface and splashed down 0.59 miles from the predicted site off the coast of San Diego.
To mitigate the phenomena observed during Artemis I, NASA shortened the maximum downrange distance between atmospheric entry and splashdown. This limited the duration the heat shield spent in the critical temperature range. Additionally, the backshell—comprising 1,300 ceramic tiles—showed expected performance, with no signs of overheating at windows, vents, thrusters, or the side hatch.
Background and Context
The analysis involved diver imagery, recovery ship inspections, and subsequent examinations at the Kennedy Space Center and Marshall Space Flight Center. Engineers utilized internal x-ray scans, sample extraction, and post-flight laser scans to determine material recession. These efforts were informed by prior arc jet material testing at the Ames Research Center.
Significance and Outlook
The Artemis II data has led to design upgrades for Artemis III to ensure uniformity and consistent permeability of the Avcoat blocks. The Artemis III Orion crew module’s heat shield was attached in early July, and the crew and service modules were joined by the end of July. NASA is now preparing for a mission in low Earth orbit featuring astronauts Randy Bresnik, Frank Rubio, Andre Douglas, and Luca Parmitano to demonstrate systems for future landings, starting with Artemis IV in 2028.
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