Announcement of Opportunity for Ryugu and Bennu Samples

Key milestones

  • Call for proposals for the AO: March 31, 2026
  • Deadline for Notice of Intent to propose (mandatory): April 22, 2026 (UTC 23:59)
  • Deadline for submission of sample requests: April 30, 2026 (UTC 23:59)
  • Decision announcement: To be announced following the selection process.
  • Sample distribution: To be scheduled following the official announcement.
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The Astromaterials Science Research Group (ASRG) of ISAS/JAXA calls for proposals for Ryugu and Bennu Samples, returned from the asteroid Ryugu, and OSIRIS-REx samples, returned from the asteroid Bennu. All proposals will be subjected to peer review, and allocated samples to successful proposers will be available for one year.
Important notice:
From AO2026 onward, submission of a signed Terms and Conditions document is required at the time of proposal submission. For further details, please refer to the AO guidebook.

Guidebook for Proposers
(Updated March 31, 2026)
Guidebooks for previous AOs
Proposal template (.docx)
Ryugu sample database
Bennu sample database
References related to
Ryugu sample analysis
Accepted proposals in
previous AOs
Reviewers in
previous AOs
Documents for
accepted proposers

Contact: Astromaterials Science Research Group, JAXA

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