Performance of the Extreme Ultraviolet Explorer Imaging Telescopes

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.