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December 2009
Hubble Space Telescope Call for Proposals
for Cycle 18
Policies, Procedures &
Phase I Proposal Instructions
Call for Proposals
We invite scientists to participate in Cycle 18 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 3000 orbits in Cycle 18, including up to 500 orbits for Large and Treasury proposals, with the remainder allocated to regular GO and GTO Programs. An additional 500-800 SNAPSHOT orbits may also be allocated. Abstracts of previously accepted programs can be found on the HST proposal catalogs Web page, listed in Appendix D.
Phase I Deadline: February 26, 2010, 8:00 pm EST.
E/PO Deadline: August 25, 2010, 5:00 pm EDT.
Where to Get Help
Contact the STScI Help Desk. Either send e-mail to or call 1-800-544-8125; from outside the United States and Canada, call [1] 410-338-1082.
Who’s Responsible
The Science Policies Group (SPG), part of the STScI Science Mission Office (SMO), is responsible for the HST science program selection process. The SPG staff includes astronomers Claus Leitherer (Head), Daniel Apai, Bob Williams, Technical Manager Brett Blacker, and Administrative Assistant Darlene Spencer.
The Cycle 18 Call for Proposals was edited by
Daniel Apai and Jim Younger,
based in part on versions from previous cycles, and with text and assistance from many different individuals at STScI.

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