Hubble Space Telescope Call for Proposals for Cycle 30

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

    • Feb 15, 2022: To avoid clashes between HST Cycle 31 activities and JWST Cycle 2 activities, it is likely that HST Cycle 30 will be extended by 2 months (through to 30 November 2023), and the orbit allocation for Cycle 30 increased by up to 500 orbits. A final decision will be made towards the end of JWST commissioning, prior to the HST Proposal Review. As usual, the orbits will be distributed proportionately among the proposal categories. For more information, see the February 2022 JSTUC presentation.
    • Feb 14, 2022: APT 2022.1 was released on Feb 11. Cycle 30 proposers should use this version to submit their proposals. Submissions started in earlier versions can be transferred to 2022.1.
    • Jan 20, 2022: APT 2022.1 or later must be used for Cycle 30 proposal submissions. This will be released by mid-February. We will alert the community as soon as it is available.
    • Jan 11, 2022: Long-term GO programs may only include non-disruptive ToOs for execution in future cycles.

See also HST New and Important Features.


We invite scientists to participate in Cycle 30 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 3000 orbits in this cycle, including 1500 orbits for Small Programs, 800 orbits for Medium Programs, and 700 for Large and Treasury Programs. An additional 1000 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 30. 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 30"). The links at the top of each page correspond to sections within that given page.

Proposing Calendar and Deadlines

Cycle 30 Dates: October 1, 2022 – September 30, 2023

Cycle 30 Phase I proposal deadline: March 25, 2022 at 8:00pm EDT

Cycle 30 Peer Review meeting: June 1-8, 2022

Cycle 30 Phase II proposal deadline: July 14, 2022

Cycle 30 Budget submission deadline: August 4, 2022 at 8:00pm EDT

Cycle 30 1st Mid-Cycle deadline: October 21, 2022 at 11:59pm EDT

Cycle 30 2nd Mid-Cycle deadline: February 17, 2023 at 11:59pm EST

Notification of the outcome of the Phase I selection process will be sent to all proposers in late June 2022.

What's New for Cycle 30

See HST New and Important Features

Where to Get Help

Who's Responsible

The HST Call for Proposals and related materials for Cycle 30 were edited by John Debes and Laura Watkins. The Associate Director for Science, Neill Reid, and the Science Mission Office at STScI are responsible for the oversight of the HST science program selection process, whose members include Alessandra Aloisi (Head of Science Mission Office), John Debes (Deputy Head of Science Mission Office), Claus Leitherer (Head of Hubble Space Telescope Science Policies Group), Katey Alatalo, Christine Chen, Andrew Fruchter, Amaya Moro-Martin, Molly Peeples, Jamila Pegues, Linda Smith, Laura Watkins, 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.

Next: HST New and Important Features