The launch window shifted - a single date cost Hayabusa Mk II its flight
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The launch window shifted - a single date cost Hayabusa Mk II its flight
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The launch window shifted - a single date cost Hayabusa Mk II its flight
In this episode, we follow the story of a proposed Japanese sample-return mission to dormant comet 4015 Wilson-Harrington and the decisions that stopped it before it was built. We trace the technical plans, international proposal process, and the single timing constraint that defined the mission’s fate - could a launch date decide whether pristine solar system chemistry ever reached Earth labs?
Person: Japan Aerospace Exploration Agency engineers
Object: 4015 Wilson-Harrington (1979 VA)
Mission: Hayabusa Mk II / Marco Polo proposal
Date: Launch window 2018; ESA selection decision February 2010; joint proposal submitted June 2007, assessment November 2007
Scientists: more than 400 worldwide
- Engineers designed Hayabusa Mk II as a generational redesign with a larger sample-return capsule and more capable ion engines tailored for a comet surface.
- Wilson-Harrington is a dormant comet whose insulated nucleus could preserve 4.6 billion-year-old molecular chemistry and complex organics.
- JAXA partnered with ESA to submit the Marco Polo proposal to Cosmic Vision 2015-2025 and cleared formal assessment in November 2007.
- The mission’s 2018 launch window was fixed by trajectory calculations, planetary alignments, and engineering timelines documented in hundreds of pages.
- ESA’s Science Programme Committee made its selections in February 2010, a single administrative decision that intersected with Hayabusa Mk II’s critical timing.
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