Astronomy and Astrophysics – Astronomy
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hsth..........k&link_type=abstract
Unknown
Astronomy and Astrophysics
Astronomy
Handbooks, Hubble Space Telescope, Spaceborne Astronomy, Spacecraft Instruments, Spectrographs, Apertures, Brightness, Calibrating, Exposure, Spectral Resolution, Temporal Resolution
Scientific paper
This version of the FOS Instrument Handbook is for the refurbished telescope, which is affected by an increase in throughput, especially for the smaller apertures, a decrease in efficiency due to the extra reflections of the COSTAR optics, and a change in focal length. The improved PSF affects all exposure time calculations due to better aperture throughputs and increases the spectral resolution. The extra reflections of COSTAR decrease the efficiency by 10-20 percent. The change in focal length affects the aperture sizes as projected on the sky. The aperture designations that are already in use both in the exposure logsheets and in the project data base (PDB) have not been changed. Apertures are referred to here by their size, followed by the designation used on the exposure logsheet.
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