A Far Ultraviolet Imaging Spectrograph for Shuttle

Astronomy and Astrophysics – Astronomy

Scientific paper

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Space Shuttle Payloads, Spaceborne Astronomy, Spacecraft Instruments, Spectrographs, Ultraviolet Spectrometers, Atmospheric Radiation, Comets, Nebulae, Structural Design

Scientific paper

The development of the Far Ultraviolet Imaging Spectrograph (FUVIS) Shuttle sortie missions, is described. Objectives of the experiment are to obtain spatially-resolved far-ultraviolet spectra of extraterrestrial sources, including emission-line and reflection nebulae, diffuse background radiation, extragalactic objects, and comets. The use of fast focal ratio (f/1) Schmidt optics and an opaque CsI photocathode which affords high quantum efficiency in the far-UV provides the maximum possible diffuse source sensitivity. Measured emission line intensities of 5 Rayleighs (or continua of intensity 1 R/A) in 300 sec exposures are expected. The development includes a dedicated pointing platform and a low light level television camera for payload specialist use in target acquisition and guiding.

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