Computer Science
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.6146k&link_type=abstract
HST Proposal ID #6146
Computer Science
Hst Proposal Id #6146
Scientific paper
We will determine filter grating wheel repeatability for 3 grating settings in both the FOS detectors (G270H, G190H and G130H for the Blueside, and G190H, G400H and the G570H for the Redside). We will also determine the impact of the onboard GIM. This will be achieved by comparing DEPERMed data with un-DEPERMed data. We propose to obtain 10 observations each for 3 representative gratings (G270H, G190H and G130H for the Blueside, and G190H, G400H and the G570H for the Redside). The 10 observations will be separated by 10 days each. We will then measure the location of spectra for all the remaining science apertures on both the detectors using only the G400H grating. 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 highest priority because our ability to acquire spectra depends on our knowledge of Y_Base values. The y-base maps will also be obtained every month for the rest of the cycle. Multiple observations are necessary during the cycle since we know from previous cycles that the location of the spectra has changed with time. Total spacecraft time is 30 hours of NON-PRIME time.
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