Announcement of Opportunity for Ryugu and Bennu Samples

Key milestones

  • Call for proposals for the AO: February 7,2025
  • Deadline for Notice of Intent to propose (mandatory): February 26, 2025 (UTC 23:59) CLOSED
  • Deadline for submission of sample requests: March 18, 2025 (UTC 23:59)
  • Decision announcement: Early July, 2025 To be announced after internal procedures are completed.
  • Sample distribution: July, 2025 To be scheduled after 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.
We would like to thank all the reviewers who contributed to the reviewing the proposals from AO1 to AO5. With their permission, the reviewers' names are listed here.

Guidebook for Proposers
(Updated October 22, 2025)
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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