NASA panel confirms Orion heat shield performed well on Artemis II
NASA's Aerospace Safety Advisory Panel has confirmed that the heat shield on the Orion capsule performed well during the Artemis II mission, resolving a major point of concern that had lingered since problems emerged during Artemis I in 2022. On that earlier uncrewed test flight, the ablative heat shield unexpectedly lost large chunks of char, prompting NASA to keep the same design for Artemis II but alter the capsule's reentry trajectory rather than replace the shield outright. After Artemis II's crew, led by commander Reid Wiseman, safely splashed down in the Pacific following a crewed lunar flyby, officials have now verified through detailed data review that the fix worked, easing concerns about the vehicle's readiness for future deep-space missions.
Panel member Paul Hill said the heat shield's condition was "highly satisfying", noting that Artemis I had produced more than 100 char loss sites, some over an inch deep, compared with roughly nine on Artemis II. The improvement came from flying a steeper reentry angle to reduce time spent in conditions that caused gas to become trapped in the Avcoat material, though this cut the capsule's downrange capability from 4,800 to 1,775 nautical miles. NASA plans to use a more permeable Avcoat for Artemis III and beyond, aiming to avoid char loss while restoring greater downrange range. Panel members also praised NASA's broader progress this year, particularly since Administrator Jared Isaacman's March "Ignition" event outlining accelerated Artemis and Moon base plans.
- Orion's Artemis II heat shield performed far better than the troubled Artemis I one
- Char loss sites dropped from over 100 to about nine after trajectory change
- NASA will use more permeable material for Artemis III to regain downrange range
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Orion is NASA’s crew spacecraft for carrying astronauts beyond low Earth orbit. Its heat shield protects the capsule from the extreme heat of re-entry into Earth’s atmosphere; it is made from Avcoat, a material designed to wear away and carry heat off the spacecraft.
During the uncrewed Artemis I test in 2022, the shield lost more charred material than expected. NASA kept the same shield design for the next flight but changed Orion’s return path. This mattered because the shield must protect the crew reliably on future missions.
NASA plans to use a more permeable version of Avcoat on later flights, including Artemis III. The change is intended to reduce material loss while allowing Orion to travel farther before landing, a capability affected by the revised return path.
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Originally published by Ars Technica as “It turns out that Orion’s much-maligned heat shield performed really well”.