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Space Telescope Science Institute |
Cycle 20 Phase II Proposal Instructions |
12.14 COS Spectral Elements and Central WavelengthsThe following table specifies the legal COS spectral element/wavelength combinations for the COS/FUV and COS/NUV configurations.
Table 12.3: COS Spectral Elements and Central Wavelengths Spectral Element 1786, 1817, 1835, 1850, 1864, 1882, 1890, 1900, 1913,1921, 1941, 1953, 1971, 1986, 2010 2186, 2217, 2233, 2250, 2268, 2283, 2306, 2325, 2339, 2357, 2373, 2390, 2410 2617, 2637, 2657, 2676, 2695, 2709, 2719, 2739, 2850, 2952, 2979, 2996, 3018, 3035, 3057, 3074, 3094 MIRRORB3
ACQ modes not allowed with this central wavelength.
The MIRRORA spectral element positions a flat mirror in the beam to produce an image of the sky with a field of view slightly larger than the diameter of the aperture. If you intend to produce an image and there are no special bright object concerns, MIRRORA should be used.
MIRRORB uses the same mirror which has an order-blocking filter in front of it, so that the light is reflected off the front surface of the filter rather than the mirror itself. MIRRORB attenuates the image and is suitable for use with bright objects.