Hubble Space Telescope Call for Proposals for Cycle 26

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

The call for HST Cycle 26 GO and AR proposals is now closed.

Investigators may still submit proposals for Cycle 26 Mid-Cycle Time or Director's Discretionary Time.

For the current Call for Proposals, see Hubble Space Telescope Call for Proposals for Cycle 27


We invite scientists to participate in Cycle 26 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 2100 orbits in this cycle. An additional 250 Pure-Parallel orbits 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 26. 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 26"). The links at the top of each page correspond to sections within that given page.

Proposing Calendar and Deadlines

  • Phase I proposal deadline:

    August 17, 2018 at 8:00pm EDT

    Team Expertise and Background sections must be submitted separately by email, by August 24, 2018

  • Cycle 26 Peer Review: 

    October 2018
  • Phase II proposal deadline:

    November 29, 2018
  • Budget deadline: 

    December 05, 2018

  • Cycle 26 Mid-Cycle Deadline: 

    January 30, 2019

Notification of the outcome of the Phase I selection process will be sent to all proposers in late October or early November.

What's New for Cycle 26

See HST Cycle 26 New and Important Features

Where to Get Help

Who's Responsible

The HST Call for Proposals and related materials for Cycle 26 were edited by Lou Strolger, Brian Williams, and Dan Coe, with many contributions from Paul Mulgrew, Susan Rose, Dave Adler, Annalisa Calamida, Ron Downes, Andrew Fox, Cristina Oliveira, Gisella de Rosa, David Sahnow, Paula Sessa, and Paule Sonnentrucker.

Members of the Science Mission Office at STScI are responsible for the oversight of the HST science program selection process. The members involved include Neill Reid (Associate Director for Science and Head of the Science Mission Office), Amaya Moro-Martin, Louis-Gregory Strolger, Brian Williams, and Technical Manager Brett Blacker. The members of the Science Policies Group include Claus Leitherer (head), Neill Reid, Alessandra Aloisi, Andy Fruchter, Jennifer Lotz, Amaya Moro-Martin, and Molly Peeples.

Next: HST Cycle 26 New and Important Features

Hubble Space Telescope Call for Proposals for Cycle 26

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HST Proposal Opportunities and Science Policies

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