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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 funding research on archival HST data. It also provides an overview of HST's expected capabilities for that observing cycle, including information about the telescope and the available scientific instruments.
Documentation and instructions to support writing and submitting a proposal for HST observing time.
Guide for providing the details to schedule and obtain HST observations after a Phase I proposal approval.
Results from current and past HST proposal cycles, including approved programs and abstract and exposure catalogs.
STScI maintains these documents in support of HST proposal preparation, observations, and data analysis.
December 2025
Observatory brochure including instrument pocket guides with detailed characteristics.
Previous versions of these instrument handbooks, as well as legacy instrument handbooks, can be found on the Handbook Archive page.
Previous versions of these data handbooks, as well as legacy instrument data handbooks, can be found on the Handbook Archive page.
The STScI Director has commissioned reports from a number of working groups on community initiatives covering topics such Deep Fields, the ULLYSES project, HST observations of gravitational wave optical counterparts, and the HST-TESS initiative.
Those reports can be found on STScI's Outerspace, a service for collaboration and engagement with the astronomical community and our partners.
Find the latest HST news and events, in addition to articles about HST in the STScI newsletter, right here.
Get the latest HST news including updates on instruments, proposing, approved programs, and more.
Find all of the HST-related articles published in the STScI newsletter in one place.
Get details on STScI events, such as colloquia, meetings, workshops, and conferences.
Read the latest press releases for the HST Observatory at NASA.gov.
Please contact the HST Help Desk with any questions.
