The International Ultraviolet Explorer

Astronomy and Astrophysics – Astronomy

Scientific paper

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Instrument Packages, Iue, Satellite-Borne Instruments, Spaceborne Astronomy, Background Noise, Echelle Gratings, Photometry, Spaceborne Telescopes, Spectrographs, Wavelengths

Scientific paper

The instrumentation and functioning of the IUE are discussed. The design of the telescope, fine error sensors, echelle spectrographs, and television cameras, as well as their integration, is described. The optical characteristics of the IUE are listed and the schematic arrangement of the detector is depicted. Sources of background noise are assessed, including the thermionic effects in the UV converters and television tubes, radiation from the earth's trapped electron belts, wide angle white light scattering from the earth and sun, scattering of dispersed light caused by low dispersion gratings, photometric calibration, and photometric stability. IUE sensitivity changes during the first three years of operation are shown together with sensitivity curves for short and long wavelengths. Modes of wavelength determination are considered.

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