Hubble Space Telescope
Call for Proposals

HST Call for Proposals
HST Call for Proposals for Cycle 25
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Hubble Space Telescope Call for Proposals for Cycle 25

We invite scientists to participate in Cycle 25 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 3,550 orbits in this cycle, plus an additional 1,200 orbits to be pre-allocated for Cycle 26, totaling up to 3,000 orbits for Small Programs, 650 orbits for Medium Programs, and 1,100 orbits for Large and Treasury Programs. An additional 1,000 Snapshot observations and 500 Pure-Parallel observations may be allocated. Abstracts of previously accepted programs can be found on the HST proposal catalogs webpage.
Phase I proposal deadline: Friday, April 7, 2017, 8:00 pm EDT
Phase II proposal deadline: Thursday, July 20, 2017
Budget deadline: Thursday, August 10, 2017
Contact the STScI Help Desk. Either send an e-mail to help@stsci.edu, call 1-800-544-8125, or call +1-410-338-1082 from outside the U.S. and Canada.
The Cycle 25 Call for Proposals was edited by Louis-Gregory Strolger and Susan Rose, based in part on versions from previous cycles, and with text and assistance from many different individuals at STScI, in particular Faith Abney, Ron Downes, Linda Dressel, Andrew Fox, Cathrine Kaleida, Claus Leitherer, Karen Levay, Neill Reid, Paula Sessa, Paule Sonnentrucker, Denise Taylor, and Brad Whitmore.

Hubble Space Telescope Call for Proposals for Cycle 25

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