The 1st thing astronauts will see on Artemis II is not recruited in the Moon, it is the lengthy silence after leaving low Earth orbit, a silence that no US crew has known since 1972.
That is the situation that scarcely falls upon the Space Launch System and Orion stack as it goes to the pad with NASA on the first test flight crew to deep space in more than 50 years. To be less of a victory trip and more of a check-up, Artemis II is constructed as a 10-day orbit of the Moon to test Orion life support, power, navigation, communications, and recovery choreography with four people on board. The real worth of the mission lies in the engineering margins on the side, that the vehicle will act as intended when the Earth is no longer nearby to take pity.
In real life, NASA is applying an all-too-familiar near-term milestone, a wet dress rehearsal scheduled no sooner than Feb. 2, as the gatekeeper to all that comes after it. That test is not theatrical. It is a full dress run of loading propellant and countdown operations that leaves the ground systems, flight hardware and individuals in the loop challenged by the sloppy interface between cryogenics, valves, sensors and real time timing. The prelaunch campaign of Artemis I itself demonstrated that even “routine” can fail when subjected to the behavior of hydrogen, scrub after scrub, and measures to minimize recurrences of those failure modes have been taken since.
The problem with the headline chosen by Orion is less obvious: the heat shield did its job, but not the way engineers hoped it would, model-friendly. Postflight investigations attributed the anomalous loss of the char in the ablative material inside the bottleneck of Avcoat to the fact that the ablative material was not ablating as expected in reentry. When Orion was in the skip-entry profile, the gases produced in the ablator did not escape in the intended fashion, the pressure accumulated and the cracking enabled the pieces of the burnt material to lose. NASA recreated the behavior in enhanced arc-jet tests by equating the lower heating rates during the flight as opposed to more harsh test conditions which obscured the issue and eventually determined that Artemis II could fly under operational changes as shields are built in larger quantities with uniform permeability.
The agency position was put in peculiar perspective by two quotes of the rollout briefing. Amit Kshatriya, the deputy associate administrator in the Moon to Mars Program Office said, “Our early Artemis flights are a test campaign.” Orion program manager Howard Hu said, “We took our heat shield investigation process extremely seriously with crew safety as the driving force.” Neither is marketing copy, both are a reminder of the fact that Artemis II is a risk-reduction mission and that Artemis III puts too many firsts lunar landing systems, spacesuits, and complicated operations in one attempt.
Artemis has also arrived with the beginning of ISS era ending. The long-term objective of NASA is to orbit the station to 2030 and deorbit it in a controlled way, where a special spacecraft will be used to provide the final targeting burn. This shift is important to Artemis since it alters what NASA can afford, invest, and humanize as its priority: to have persistent access to microgravity research through commercial platforms and reorient the human exploration centre of gravity of the agency around the Moon.
The outcome is a program which seems like two engineering problems, executing in parallel; dismantling a spacecraft with a football-field-size footprint safely, and certifying a deep-space stack with each subsystem required to be far from home. Artemis II is at the interface of the two-in-one-mission, not a mission, but an overhead of the coming decade of human spaceflight.
.jpg){kind=link}