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Faint Object Spectrograph

Published by MAST: Mikulski Archive at Space Telescope | National Aeronautics and Space Administration | Catalog Last Checked: July 14, 2026 at 11:02 PM | Dataset Last Updated: June 22, 2026
The Faint Object Spectrograph (FOS) was one of the 4 original axial instruments aboard the Hubble Space Telescope (HST). The FOS was designed to make spectroscopic observations of astrophysical sources from the near ultraviolet to the near infrared (1150 - 8000 Angstroms). The instrument was removed from HST during the Second Servicing Mission in February 1997.

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