HST Proposal Opportunities and Science Policies

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margin-bottom: 8px; table-layout: fixed; width: 100%;" class="conf-macro output-block" data-hasbody="true" data-macro-name="sp-pagelayout"> <div style="display: table-cell; margin: 8px 0; padding: 0 10px; vertical-align: top; word-wrap: break-word; width: auto;"> <div style="display: block; overflow-x: auto;"> <p>Articles in this section comprise the traditional Call for Proposals.  These articles include information on observing and science policies, and details on the proposal submission process, including roadmaps.</p><p>Downloadable PDF collections of these articles are provided as a courtesy, made available and updated when feasible. <em><strong>The online documentation is the authority</strong></em>, and will be updated with the latest information.</p><hr><p style="text-align: center;"></p><div class="toc-macro client-side-toc-macro conf-macro output-block" data-structure="flat" data-cssliststyle="none" data-csslistindent="20px" data-headerelements="H1,H2" data-hasbody="false" data-macro-name="toc"></div><p></p><hr><h1 id="HSTProposalOpportunitiesandSciencePolicies-CurrentHSTProposalOpportunities">Current HST Proposal Opportunities</h1><hr><p></p><div class="plugin_pagetree conf-macro output-inline" data-hasbody="false" data-macro-name="pagetree"> <ul role="list" aria-busy="true" class="plugin_pagetree_children_list plugin_pagetree_children_list_noleftspace"> <div class="plugin_pagetree_children"> </div> </ul> <fieldset class="hidden"> <input type="hidden" name="treeId" value=""> <input type="hidden" name="treeRequestId" value="/plugins/pagetree/naturalchildren.action?decorator=none&excerpt=false&sort=position&reverse=false&disableLinks=false&expandCurrent=false&placement="> <input type="hidden" name="treePageId" value="148639929"> <input type="hidden" name="noRoot" value="false"> <input type="hidden" name="rootPageId" value="148639929"> <input type="hidden" name="rootPage" value=""> <input type="hidden" name="startDepth" value="0"> <input type="hidden" name="spaceKey" value="HSP"> <input type="hidden" name="i18n-pagetree.loading" value="Loading..."> <input type="hidden" name="i18n-pagetree.error.permission" value="Unable to load page tree. It seems that you do not have permission to view the root page."> <input type="hidden" name="i18n-pagetree.eeror.general" value="There was a problem retrieving the page tree. Please check the server log file for more information."> <input type="hidden" name="loginUrl" value="/login.action?os_destination=%2Fhsp&permissionViolation=true"> <input type="hidden" name="mobile" value="false"> <input type="hidden" name="placement" value=""> <fieldset class="hidden"> <input type="hidden" name="ancestorId" value="148639929"> </fieldset> </fieldset> </div><p></p><h1 id="HSTProposalOpportunitiesandSciencePolicies-Announcement">Announcement</h1><hr><p><strong>Release Notice: December 18, 2024</strong></p><p>We are pleased to announce the Cycle 33 Call for Proposals for <em>Hubble Space Telescope</em> (<em>HST</em>) observations and funding for archival research programs.</p><p>Participation in this program is open to all categories of organizations, both domestic and foreign, including educational institutions, profit and nonprofit organizations, NASA Centers, and other Government agencies.</p><p><strong>Cycle 33 will extend from  November 1, 2025 to October 31, 2026.</strong> We will accept proposals for the following instruments: ACS, COS, FGS, STIS, and WFC3.</p><p>We anticipate allocating up to <span class="conf-macro output-inline" data-hasbody="false" data-macro-name="multiexcerpt-include">2600</span> orbits in this cycle. See <a data-macro-name="sp-nobody-link" href="/hsp/hubble-space-telescope-call-for-proposals-for-cycle-33" class="conf-macro output-inline" data-hasbody="false">Hubble Space Telescope Call for Proposals for Cycle 33</a> for further details.  </p><p>This solicitation for proposals will be open through <strong class="conf-macro output-inline" data-hasbody="false" data-macro-name="multiexcerpt-include">Thursday, April 10, 2025 at 8:00pm EDT</strong>. The <a rel="nofollow" class="external-link" href="http://www.stsci.edu/hst/proposing/apt">Astronomer's Proposal Tool</a> (APT), which is required for Phase I Proposal Submission, will be made available for Cycle 33 Phase I use in February 2025. Results of the selection will be announced by mid-late July 2025.</p><p>Questions can be addressed to the STScI HST Help Desk (<a rel="nofollow" class="external-link" href="https://hsthelp.stsci.edu">https://hsthelp.stsci.edu</a>). </p><h1 id="HSTProposalOpportunitiesandSciencePolicies-TheCycle33CallforProposals">The Cycle 33 Call for Proposals</h1><hr><p>The Call for Proposals (CP) invites the astronomical community to propose for observing time on HST in a given cycle (nominally one year in duration). It summarizes the policies and procedures for proposing in that cycle of HST observing, including requests for research funding on archival HST data.  See <a data-macro-name="sp-nobody-link" href="/hsp/hubble-space-telescope-call-for-proposals-for-cycle-33" class="conf-macro output-inline" data-hasbody="false">Hubble Space Telescope Call for Proposals for Cycle 33</a> for more information.</p><p><a data-macro-name="sp-nobody-link" href="/hsp/the-hubble-space-telescope-primer-for-cycle-33" class="conf-macro output-inline" data-hasbody="false">The Hubble Space Telescope Primer for Cycle 33</a> provides an overview of the Hubble Space Telescope, with basic information about the telescope operations, instrument capabilities, and technical aspects of the proposal preparation process. </p><p><span class="conf-macro output-inline" data-hasbody="false" data-macro-name="multiexcerpt-include"></span></p><hr><h1 id="HSTProposalOpportunitiesandSciencePolicies-LateBreakingNews">Late Breaking News</h1><ul><li><strong><span style="text-decoration: none;">April 1, 2025:</span></strong><ul><li><strong><span style="text-decoration: none;">Observations of Moving Targets:</span></strong><span style="text-decoration: none;"> We have relaxed the restrictions on observations of moving targets. Visits will have a typical practical limit of about 6 contiguous orbits, but are no longer strictly limited to 2 contiguous orbits.</span></li></ul></li><li><strong><span style="text-decoration: none;">March 25, 2025:</span></strong><ul><li><strong><span style="text-decoration: none;">New COS Lifetime Usage Policy: </span></strong><span style="text-decoration: none;">Starting in Cycle 33, COS FUV programs will be limited to a maximum of 2% lifetime usage per Lifetime Position (LP), with usage beyond 1% requiring justification in the Phase I proposal. Proposers should consult the <a rel="nofollow" class="external-link" href="https://www.stsci.edu/contents/news/cos-stans/march-2025-stan">updated lifetime usage table</a></span><span style="text-decoration: none;"> to determine whether their proposed observations approach or exceed the usage limits.</span></li></ul></li><li><strong><span style="text-decoration: none;">February 3, 2025:</span></strong><ul><li><strong><span style="text-decoration: none;">New COS Lifetime Positions: </span></strong><span style="text-decoration: none;">Starting in Cycle 33, FUV gratings G130M utilizing cenwaves 1055, 1096, 1222, and 1291 and G160M utilizing all cenwaves will move to use new lifetime positions (LPs). Similar to previous moves, these LPs have different overheads and spectral resolution. More information is available in the <a rel="nofollow" class="external-link" href="https://www.stsci.edu/contents/news/cos-stans/march-2025-stan">March 2025 STAN</a>.</span></li></ul></li><li><strong><span style="text-decoration: none;">January 9, 2025:</span></strong><ul><li><strong>APT: </strong><a rel="nofollow" class="external-link" href="https://www.stsci.edu/scientific-community/software/astronomers-proposal-tool-apt/">APT 2024.7.1</a><span> </span>is now available. Cycle 33 proposers should use this version to submit their proposals. Submissions started in earlier versions can be transferred to 2024.7.1.</li></ul></li></ul><p>See also <a data-macro-name="sp-nobody-link" href="/hsp/hubble-space-telescope-call-for-proposals-for-cycle-33/hst-new-and-important-features" class="conf-macro output-inline" data-hasbody="false">HST New and Important Features</a>.</p><p><br></p><p></p><p><br></p><p><span class="conf-macro output-inline" data-hasbody="false" data-macro-name="multiexcerpt-include"></span></p><h1 id="HSTProposalOpportunitiesandSciencePolicies-ScienceJustificationTemplates">Science Justification Templates</h1><p>Templates for HST <span class="conf-macro output-inline" data-hasbody="false" data-macro-name="multiexcerpt-include">Cycle 33</span> Proposal PDF attachments:</p><div class="table-wrap"><table class="wrapped confluenceTable"><colgroup><col style="width: 112.0px;"><col style="width: 118.0px;"><col style="width: 123.0px;"><col style="width: 121.0px;"></colgroup><tbody><tr><th style="text-align: center;" class="confluenceTh">Templates</th><th style="text-align: center;" class="confluenceTh"><div class="content-wrapper"><p>LaTeX</p><p>& <a data-macro-name="sp-nobody-link" href="/hsp/files/148639968/148639981/1/1726849521340/phase1.sty" class="conf-macro output-inline" data-hasbody="false">phase1.sty</a></p></div></th><th style="text-align: center;" class="confluenceTh"><p>Microsoft</p><p>Word</p></th><th style="text-align: center;" class="confluenceTh"><p>PDF</p><p>output</p></th></tr><tr><td class="confluenceTd">GO</td><td class="confluenceTd"><div class="content-wrapper"><p><span style="color: rgb(153,204,0);"><a data-macro-name="sp-nobody-link" href="/hsp/files/148639968/148639969/1/1728654298093/phase1-GO.tex" class="conf-macro output-inline" data-hasbody="false">phase1-GO.tex</a></span></p></div></td><td class="confluenceTd"><div class="content-wrapper"><p><a data-macro-name="sp-nobody-link" href="/hsp/files/148639968/148639971/1/1728590864978/phase1-GO.docx" class="conf-macro output-inline" data-hasbody="false">phase1-GO.docx</a></p></div></td><td class="confluenceTd"><div class="content-wrapper"><p><a data-macro-name="sp-nobody-link" href="/hsp/files/148639968/148639970/1/1728654285055/phase1-GO.pdf" class="conf-macro output-inline" data-hasbody="false">phase1-GO.pdf</a></p></div></td></tr><tr><td class="confluenceTd">AR</td><td class="confluenceTd"><div class="content-wrapper"><p><span style="color: rgb(153,204,0);"><a data-macro-name="sp-nobody-link" href="/hsp/files/148639968/148639973/1/1728590819859/phase1-AR.tex" class="conf-macro output-inline" data-hasbody="false">phase1-AR.tex</a></span></p></div></td><td class="confluenceTd"><div class="content-wrapper"><p><a data-macro-name="sp-nobody-link" href="/hsp/files/148639968/148639983/1/1726849521434/phase1-AR.docx" class="conf-macro output-inline" data-hasbody="false">phase1-AR.docx</a></p></div></td><td class="confluenceTd"><div class="content-wrapper"><p><a data-macro-name="sp-nobody-link" href="/hsp/files/148639968/148639977/1/1726849521218/phase1-AR.pdf" class="conf-macro output-inline" data-hasbody="false">phase1-AR.pdf</a></p></div></td></tr><tr><td class="confluenceTd">GO/DD</td><td class="confluenceTd"><div class="content-wrapper"><p><span style="color: rgb(153,204,0);"><a data-macro-name="sp-nobody-link" href="/hsp/files/148639968/148639972/1/1728590836443/phase1-DD.tex" class="conf-macro output-inline" data-hasbody="false">phase1-DD.tex</a></span></p></div></td><td class="confluenceTd"><div class="content-wrapper"><p><a data-macro-name="sp-nobody-link" href="/hsp/files/148639968/148639984/1/1726849521463/phase1-DD.docx" class="conf-macro output-inline" data-hasbody="false">phase1-DD.docx</a></p></div></td><td class="confluenceTd"><div class="content-wrapper"><p><a data-macro-name="sp-nobody-link" href="/hsp/files/148639968/148639979/1/1726849521266/phase1-DD.pdf" class="conf-macro output-inline" data-hasbody="false">phase1-DD.pdf</a></p></div></td></tr></tbody></table></div><p>Note: the Word and LaTeX templates have intentionally different margins, to accommodate the same amount of text per page. See <a data-macro-name="sp-nobody-link" href="/hsp/hubble-space-telescope-call-for-proposals-for-cycle-33/hst-guidelines-and-checklist-for-phase-i-proposal-preparation" class="conf-macro output-inline" data-hasbody="false">HST Guidelines and Checklist for Phase I Proposal Preparation</a> for information on page limits.</p><p></p><p>See <a data-macro-name="sp-nobody-link" href="/hsp/hubble-space-telescope-call-for-proposals-for-cycle-33/hst-preparation-of-the-pdf-attachment" class="conf-macro output-inline" data-hasbody="false">HST Preparation of the PDF Attachment</a> for more information.</p><h1 id="HSTProposalOpportunitiesandSciencePolicies-DownloadthePDF">Download the PDF</h1><hr><p><span class="confluence-embedded-file-wrapper conf-macro output-inline" data-hasbody="false" data-macro-name="view-file"><a data-can-edit="false" data-linked-resource-default-alias="HST_CfP_Cycle33.pdf" data-file-src="/download/attachments/148639939/HST_CfP_Cycle33.pdf?version=1&modificationDate=1734556073953&api=v2" data-nice-type="PDF Document" data-linked-resource-id="148639940" draggable="false" data-linked-resource-container-id="148639939" data-mime-type="application/pdf" data-has-thumbnail="true" data-linked-resource-version="1" href="/hsp/files/148639939/148639940/1/1734556073953/HST_CfP_Cycle33.pdf" class="confluence-embedded-file" data-linked-resource-type="attachment" aria-label="HST_CfP_Cycle33.pdf"><img alt="" draggable="false" src="/rest/documentConversion/latest/conversion/thumbnail/148639940/1" height="250"></a></span></p><h1 id="HSTProposalOpportunitiesandSciencePolicies-SupportingDocuments">Supporting Documents</h1><hr><p></p><div class="plugin_pagetree conf-macro output-inline" data-hasbody="false" data-macro-name="pagetree"> <ul role="list" aria-busy="true" class="plugin_pagetree_children_list plugin_pagetree_children_list_noleftspace"> <div class="plugin_pagetree_children"> </div> </ul> <fieldset class="hidden"> <input type="hidden" name="treeId" value=""> <input type="hidden" name="treeRequestId" value="/plugins/pagetree/naturalchildren.action?decorator=none&excerpt=false&sort=position&reverse=false&disableLinks=false&expandCurrent=false&placement="> <input type="hidden" name="treePageId" value="148639929"> <input type="hidden" name="noRoot" value="false"> <input type="hidden" name="rootPageId" value="148639929"> <input type="hidden" name="rootPage" value=""> <input type="hidden" name="startDepth" value="0"> <input type="hidden" name="spaceKey" value="HSP"> <input type="hidden" name="i18n-pagetree.loading" value="Loading..."> <input type="hidden" name="i18n-pagetree.error.permission" value="Unable to load page tree. 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