GoKawiilApart from pesky issues with the spacecraft’s toilet and waste disposal system, most of the Artemis II mission has proceeded like clockwork. NASA has made few changes to the flight plan since the launch of the lunar flyby mission April 1.
But ground controllers revamped the timeline Wednesday as the Artemis II astronauts zoomed toward Earth after a close encounter with the Moon earlier this week. The four astronauts were supposed to take manual control of their Orion spacecraft, named Integrity, for a piloting demonstration Wednesday night.
Instead, mission managers canceled the demo to make time for an additional test of the ship’s propulsion system. The goal was to gather data on a “small leak” of helium gas, which Orion uses to push propellant through a series of tanks and pipes to feed the spacecraft’s rocket engines, said Jeff Radigan, NASA’s lead flight director for the Artemis II mission.
The spacecraft burns hydrazine fuel mixed with an oxidizer, nitrogen tetroxide, to power its main engine and thrusters for in-space maneuvers. The leak on Artemis II is in the helium pressure supply to the oxidizer side.
“The leak is not to space. It’s internal to the system across some of our valves, and we really need to characterize that to see what, if any, modifications we might need to make in the future,” Radigan said.
The valves are inside the European-built service module, which the Orion spacecraft will jettison just before reentering the atmosphere Friday evening. The Orion crew module will guide astronauts Reid Wiseman, Victor Glover, Christina Koch, and Jeremy Hansen to a safe splashdown in the Pacific Ocean. The service module will burn up in the atmosphere.
Plenty of margin
The helium leak has not affected the propulsion system’s performance so far. “All of our burns have performed nominally,” Radigan said.