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NASA has published a list of potential launch dates for the Artemis I mission (see PDF), starting as early as July 26 and running through June of next year. During this time period, due to various constraints, the space agency has preliminarily identified 158 launch opportunities.
The Artemis I mission will encompass the debut launch for NASA's large Space Launch System rocket and the second orbital flight of its Orion spacecraft. Depending on when the uncrewed demonstration mission launches, it could last from 26 to 42 days as Orion flies into a distant retrograde orbit around the Moon.
In its news release, NASA helpfully explains the various constraints behind these dates, including orbital mechanics. For example, NASA says, "The resulting trajectory for a given day must ensure Orion is not in darkness for more than 90 minutes at a time so that the solar array wings can receive and convert sunlight to electricity and the spacecraft can maintain an optimal temperature range. Mission planners eliminate potential launch dates that would send Orion into extended eclipses during the flight."
These launch windows are subject to slight changes as mission planning is refined. However, the inclusion of dates through the first half of 2023 does raise an obvious question: Does NASA think the Artemis I mission—which was originally supposed to launch in 2016—could be delayed once again and slip into next year?
"The range of dates is not meant to convey anything about the probability of launching in 2022 or 2023," Kathryn Hambleton, a NASA spokeswoman, told Ars. "All launch dates more than about two months out are preliminary. It is standard for the team to have a preliminary outlook several months ahead. We’ll set a more specific target after we complete wet dress rehearsal testing."
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