Performance of the Extreme Ultraviolet Explorer Imaging Telescopes

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Abstract
The Extreme Ultraviolet Explorer (EUVE) observatory, successfully launched on 1992 June 7, provided astronomers with the first observatory dedicated to observation in the extreme ultraviolet. The scientific objectives of EUVE include an all-sky survey in four spectral bands, a deep survey in two spectral bands, and a spectroscopic survey carried out through a NASA guest observer program. We describe here the hardware components of the four telescopes used to carry out both the all-sky survey and the deep survey, and we present the imaging and photometric performance characteristics of the instruments as determined from ground calibration and in-orbit data.