FOS Location of Spectra and Aperture

Details FOS Location of Spectra and Aperture FOS Location of Spectra and Aperture

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5530k&link_type=abstract

HST Proposal ID #5530

Physics

Hst Proposal Id #5530

Scientific paper

We propose to obtain y-base maps to determine the locations of spectra and the corse aperture location for the 0.3" aperture for all grating settings in both the FOS detectors. We will then measure the location of spectra for all the remaining science apertures on both the detectors using only the G190H or G400H gratings. Since we know that the FOS mechanisms are reasonably well aligned, the small number of observations should suffice and the difference in the location of the spectra should be solely due to the single versus the paired apertures. This test has the highest priority because our ability to acquire spectra depends on our knowledge of Y_Base values. The y-base maps will be obtained every 3 months during the cycle. It is necessary to conduct this test many times during the cycle since we know from previous cycles that the location of the spectra has changed with time. Total spacecraft time is XX hours of NON-PRIME time.

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