Instruments
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Telescope: |
45 cm, f/15 Ritchey-Chrétien Cassegrain |
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Spectrographs: |
Echelle (115 nm to 198 nm and 180 nm to 320 nm) |
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Apertures: |
3" and 10" by 20" image quality 2" |
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Resolution: |
1.8×104 corresponding to 0.008 nm @ 140 nm (17 km s-1) |
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1.3×104 corresponding to 0.017 nm @ 260 nm; (20 km s-1) | |
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27° in low resolution mode @ 150 nm | |
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40° in low resolution mode @ 270 nm | |
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Cameras: |
|
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SWP (115-197 nm) |
sensitivity: 2×10 -15 ergs s-1 cm-2 Å-1 |
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LWP (175-330 nm) |
sensitivity: 1×10-15 ergs s-1 cm-2 Å-1 |
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LWR (175-330 nm) |
sensitivity: 2×10-15 ergs s-1 cm-2 Å-1 |
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SWR |
Never operational |
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FES #1 |
Fine-Error-Sensor #1 has not been used in operations. |
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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. |