Hubble Space Telescope Call for Proposals for Cycle 31
STScI solicits proposals for HST Observing, Archival, and Theoretical Research. The full details are made available through two documents, the Call for Proposals, and the HST Primer. Downloadable PDF collections of these articles are provided as a courtesy, made available and updated when feasible. The online documentation is the authority, and will be updated with the latest information.
Late Breaking News
No news is good news!
See also HST New and Important Features.
We invite scientists to participate in Cycle 31 of the Hubble Space Telescope (HST). The telescope and its instruments were built under the auspices of the National Aeronautics and Space Administration (NASA) and the European Space Agency (ESA). Management of HST’s scientific program is carried out by the Space Telescope Science Institute (STScI). We anticipate allocating up to 2300 orbits in this cycle, including 1200 orbits for Small Programs, 600 orbits for Medium Programs, and 500 for Large and Treasury Programs. An additional 850 Snapshot observations and 500 Pure-Parallel observations may be allocated. Abstracts of previously accepted programs can be found on the HST proposal catalogs webpage.
This document establishes the goals, requirements, and policies for General Observer (GO) and Archival Research (AR) programs in Cycle 31. The table of contents for the web version of this document is on the right side of the page, and links there can take you to any page from any other page (click the arrow to expand the entire table of contents under "Hubble Space Telescope Call for Proposals for Cycle 31"). The links at the top of each page correspond to sections within that given page.
Proposing Calendar and Deadlines
Cycle 31 Dates: December 1, 2023 – September 30, 2024
Cycle 31 Phase I proposal deadline: Wednesday May 24, 2023 at 8:00pm EDT
Cycle 31 Peer Review meeting: August 1-9, 2023
Cycle 31 Phase II proposal deadline: September 15, 2023
Cycle 31 Budget submission deadline: September 28, 2023 at 5:00pm EDT
Cycle 31 Mid-Cycle deadline: TBD at 11:59pm EST
Notification of the outcome of the Phase I selection process will be sent to all proposers in late August 2023.
What's New for Cycle 31
See HST New and Important Features
Where to Get Help
- Read this Call for Proposals and The Hubble Space Telescope Primer for Cycle 31.
- Visit the STScI HST Phase I Proposal Roadmap and the HST Phase II Proposal Roadmap
- Visit STScI’s website at http://www.stsci.edu/
- Register (or review/check) a STScI Single Sign-On (SSO) Account.
- Contact the STScI HST Help Desk (web: https://hsthelp.stsci.edu). We encourage use of the new website where you can submit questions directly to the appropriate team of experts.
The HST Call for Proposals and related materials for Cycle 31 were edited by Laura Watkins and Molly Peeples. The Associate Director for Science, Neill Reid, and the Science Mission Office (SMO) at STScI are responsible for the oversight of the HST science program selection process. SMO members include Alessandra Aloisi (SMO Mission Head), Elena Sabbi (SMO Deputy Mission Head), Laura Watkins (SMO Deputy Mission Head), Claus Leitherer (Hubble Science Policies Lead), Molly Peeples (Hubble Science Policies Deputy Lead), Katey Alatalo, Christine Chen, Andrew Fruchter, Amaya Moro-Martin, Jamila Pegues, Linda Smith, and Technical Manager Brett Blacker.
Download the PDF
This PDF is provided as a courtesy, made available and updated when feasible. The online documentation is the authority, and will be updated with the latest information.
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