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| Space Telescope Science Institute |
| HST Call for Proposals and Primer |
| help@stsci.edu |
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We invite scientists to participate in Cycle 21 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 3200 orbits in this cycle, including 1800 orbits for Small Programs, 400 orbits for Medium Programs, and 1000 orbits for Large and Treasury Programs. An additional 1000 Snapshot observations may be allocated. Abstracts of previously accepted programs can be found on the HST proposal catalogs webpage.
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