As Orion continued along a distant retrograde orbit of the Moon on the 12th day of the Artemis I mission, team members conducted another planned test of the star trackers aboard the spacecraft. They also began another reaction control thruster flight test. Engineers hope to characterize the align
View of the Moon seen from ESA’s European Service Module that is powering NASA’s Orion spacecraft to the Moon and back, on flight day nine of the Artemis I mission, on November 24, 2022. At the time the spacecraft was en route to a distant retrograde orbit around the Moon. Credit: NASAof the Moon on the 12th day of the Artemis I mission, team members conducted another planned test of the star trackers aboard the spacecraft. They also began another reaction control thruster flight test.
Engineers hope to characterize the alignment between the star trackers and the Orion inertial measurement units by exposing different areas of the spacecraft to the Sun and activating the star trackers in different thermal states. Both of these are part of the guidance, navigation, and control system. Star trackers arethat measure the positions of stars to help the spacecraft determine its orientation.
Together, the star tracker and inertial measurement unit data are used by Orion’s vehicle management computers to compute spacecraft position, velocity, and attitude. The measurements will help engineers understand how thermal states affect theof the navigation state, which ultimately affects the amount of propellant needed for spacecraft maneuvers. Read more about Orion’s guidance, navigation, and control system in theArtist’s impression of Orion over the Moon.
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