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
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.