UVSTAR, a spectrographic telescope for the shuttle Hitchhiker-M bridge

Details UVSTAR, a spectrographic telescope for the shuttle Hitchhiker-M bridge UVSTAR, a spectrographic telescope for the shuttle Hitchhiker-M bridge

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993adspr..13..379s&link_type=abstract

Advances in Space Research (ISSN 0273-1177), vol. 13, no. 12, p. (12)379-(12)382

Computer Science

Performance

5

Emission Spectra, Extreme Ultraviolet Radiation, Imagery, Performance Prediction, Space Shuttle Payloads, Ultraviolet Astronomy, Ultraviolet Spectrometers, Ultraviolet Telescopes, Charge Coupled Devices, Earth Atmosphere, Hot Stars, Io, Numerical Control, Planetary Nebulae, Space Plasmas

Scientific paper

UVSTAR (Ultraviolet Spectrograph Telescope for Astronomical Research) is an EUV spectral imager intended as a facility instrument devoted to solar system astronomy and to astronomy. It covers the wavelength range of 500 to 1250 A, with sufficient spectral resolution to separate atomic emission lines and to form spectrally resolved images of extended plasma sources. Targets include the Io plasma torus at Jupiter, hot stars, planetary nebulae and extragalactic sources. UVSTAR will make useful measurements of emissions from the Earth's atmosphere as well. UVSTAR consists of a pair of telescopes and concave-grating spectrographs that cover the overlapping spectral ranges of 500-900 A and 850-1250 A. The telescopes use two 30 cm diameter off-axis paraboloids having a focal length of 1.4 m. An image of the target is formed at the entrance slits of two concave grating spectrographs. The gratings provide dispersion and re-image the slits at the detectors, intensified CCDs. The readout format of the detectors can be chosen by computer, and three slit widths are selectable to adapt the instrument to specific tasks. The spectrograph package has internal gimbals which allow rotation of +/- 3 deg about each of two axes. Dedicated finding and tracking telescopes will acquire and track the target after rough pointing is achieved by orienting the Orbiter. Responsibilities for the implementation and utilization of UVSTAR are shared by groups in the U.S. and Italy. UVSTAR is scheduled for flight in early 1994.

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