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    International Ultraviolet Explorer (IUE)

    International Ultraviolet Explorer
    The first satellite totally dedicated to ultraviolet astronomy. Launched in January 1978, IUE was a joint mission of NASA and the European Space Agency; it carried a 45-cm-diameter telescope and two spectrographs for use in the range 115 to 320 nm. It operated successfully for more than 18 years – the longest-lived astronomical satellite – until it was switched off in 1996.


    launch date Jan. 26, 1978
    launch vehicle Delta 2914
    launch site Cape Canaveral
    orbit 30,285 × 41,296 km × 34.3
    mass 672 kg


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