Release Notice: January 13, 2017
NASA and The Space Telescope Science Institute (STScI) are pleased to announce the Cycle 25 Call for Proposals for Hubble Space Telescope (HST) Observations and funding for Archival Research and Theoretical Research programs. 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.
Cycle 25 will extend from October 1, 2017 to September 30, 2018. We will accept proposals for the following instruments: ACS, COS, FGS, STIS, and WFC3.
This solicitation for proposals will be open through April 07, 2017 8:00pm EDT. The Astronomer's Proposal Tools (APT), which is required for Phase I Proposal Submission will be made available/released for Cycle 25 Phase I use during the last week of January 2017. Results of the selection will be announced by the end of June 2017.
Questions can be addressed to the STScI Help Desk (email: email@example.com; phone: 410-338-1082).
- Phase I Proposals: Friday April 7, 2017 8:00 pm EDT
- Phase II Proposals: Thursday July 20, 2017
- Budgets: Thursday, August 10, 2017
- March 21, 2017
Small proposals Cycle 25 vs 26
- March 16, 2017
APT 25.0.4 has been Released
- March 10, 2017
Policy Update for Snapshot Programs in Cycle 25 and 26
- February 03, 2017
Proprietary Period Discrepancy in Call for Proposals, HST Primer and APT
- February 01, 2017
APT 25.0.3 has been Released
- Pre-allocated Cycle 26 Orbits
- Budget Submission Deadline
- Proprietary Periods
- GO Proposals to Observe Venus
- The Ultraviolet (UV) Initiative
- COS Lifetime Position
- Hubble Source Catalog
- Budget Categories for Regular Archival proposals
- Joint HST-NRAO Proposals
- MAST Data Discovery Portal
- Availability of High-Level Science Products
Late Breaking News
What's New for Cycle 25
Proposal Opportunity Updates
Important Features Carried Over From Cycle 24
Proposal Opportunity Updates
Proposal Format Updates
Changes in the Proposal Review Process
New Supported Instrument Capabilities
Important Features Carried Over From Prior to Cycle 24
- Full Set of HST Documentation
The Primer provides an introductory overview of the Hubble Space Telescope and explains how to calculate the appropriate number of orbits for an observing proposal. Get the Primer as: PDF [US Letter Size], PDF [A4 Size], or as HTML.
Science Justification Templates for Cycle 25 HST Phase I
HST Phase I Roadmap
Up to 10% of the available HST observing time may be reserved for Director's Discretionary (DD) allocation.
Up to 200 orbits per cycle will be available for Mid-Cycle GO programs. Mid-Cycle programs were initiated in Cycle 23 to provide the community with an opportunity to propose for in-cycle observations of recently-discovered, non-variable objects. As such, they complement Director’s Discretionary programs, which target unexpected transient phenomena and time-critical observations..
Special Programs from Past Cycles
Status of Current and Past Programs:
- Treasury, Archival Legacy and Large
- JWST Preparatory
- UV Initiative
- Joint Observatory
- Joint XMM-HST Proposals