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    Instruments

    Telescope:

    45 cm, f/15 Ritchey-Chrétien Cassegrain

    Spectrographs:

    Echelle (115 nm to 198 nm and 180 nm to 320 nm)

    Apertures:

    3" and 10" by 20" image quality 2"

    Resolution:

    1.8×104  corresponding to 0.008 nm @ 140 nm (17 km s-1)

     

    1.3×104 corresponding to 0.017 nm @ 260 nm; (20 km s-1)

     

    27° in low resolution mode @ 150 nm

     

    40° in low resolution mode @ 270 nm

    Cameras:

     

    SWP (115-197 nm)

    sensitivity: 2×10 -15 ergs s-1 cm-2 Å-1

    LWP (175-330 nm)

    sensitivity: 1×10-15 ergs s-1 cm-2 Å-1

    LWR (175-330 nm)

    sensitivity: 2×10-15 ergs s-1 cm-2 Å-1

    SWR

    Never operational

       

    FES #1

    Fine-Error-Sensor #1 has not been used in operations.

    FES #2

    Fine-Error-Sensor #2 has been used for fine guidance throughout the mission. It has also been important as a photometer to measure the optical brightness of the sources observed. In 1991 scattered light entering the telescope required a revision of guidance procedures and affected its photometric performance.


    Last Update: 24 April 2012

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