The call for proposals for NASA Keck time in observing semester 2025A (1 February 2025 - 31 July 2025) is now open for professional research using the NASA allocation for telescope observing time at the W.M. Keck Observatory.

The opportunity to propose as a Principal Investigator (PI) for the NASA time on the Keck Telescopes is open to all U.S.-based astronomers, i.e., those with their principal affiliation at a U.S. institution.

Instruments Available for Semester 2025A

NASA Keck 2025A Proposal Submission Form

Proposer Guidelines for NASA Keck Dual Anonymous Reviews

Important Dates

August 9, 2024: NASA Keck Call for Proposals released
September 12, 2024: All NASA Keck proposals due by 4 pm PDT
December 1, 2024: Notification of NASA Keck TAC results
February 1, 2025: Start of 2025A observing semester
Questions? KeckCFP@ipac.caltech.edu