The Hubble Space Telescope Primer for Cycle 32

The HST Primer provides an introduction to the Hubble Space Telescope for Phase I proposers.

About This Document

The Hubble Space Telescope (HST) Primer for Cycle 32 is a companion document to the Hubble Space Telescope Call for Proposals for Cycle 32. It provides an overview of HST, with basic information about telescope operations, instrument capabilities, and technical aspects of the proposal preparation process. A thorough understanding of the material in this document is essential for the preparation of a competitive proposal. The Call for Proposals discusses the policies and procedures for submitting a Phase I proposal for HST observing or archival research. Technical documentation on the instruments are available in their respective handbooks, available on the HST Document overview site.

Late Breaking News

  • Monday February 5, 2024:
    • Consecutive Observations: If your observations require a string of more than 6 consecutive orbits, that string will execute at shared risk (i.e., it will not be eligible for repeat if impacted by observatory problems).  Please consider alternative observational approaches to achieve your science goals.
    • Special Requirements: Given the current performance of the Hubble pointing control system, we remind proposers that all special requirements (such as timing and orientation constraints) not requested and justified in Phase I are implemented only under exceptional circumstances.  If this renders a science program infeasible, the program risks termination.
    • HST-JWST Joint Programs: New this cycle, we require JWST APT files to be submitted for joint HST-JWST programs. Failure to do so will result in disqualification of the proposal. See Joint HST-JWST Observing Programs and Joint HST-JWST Observations for more information.

See also HST New and Important Features.

Proposing Calendar and Deadlines

  • Cycle 32 Phase I proposal deadline: Tuesday March 26, 2024 at 8:00pm EDT

  • Cycle 32 Peer Review: May 28 - June 5, 2024

  • Cycle 32 Phase II proposal deadline: Wednesday July 17, 2024

  • Cycle 32 Budget deadline: ~August 1, 2024 at 5:00pm EDT

  • Cycle 32 Mid-Cycle Deadline: TBD

Where to Get Help

Submit questions to the HST Help Desk at See for additional tools and resources.

Who's Responsible

The HST Call for Proposals and related materials for Cycle 32 were edited by Jamila Pegues. 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), Katey Alatalo, Christine Chen, Andrew Fruchter, Amaya Moro-Martin, Jamila Pegues, Linda Smith, and Technical Managers Brett Blacker and Aleksandra Hamanowicz.

Next: HST Primer: Resources, Tools, and Other Documentation