Physics
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6914d&link_type=abstract
HST Proposal ID #6914
Physics
Hst Proposal Id #6914
Scientific paper
This proposal monitors the stability of the FOS wavelength scale andlocation of spectra. For the wavelength calibration, all standardgratings are used with the 0.3" circular and either the 0.1" or 0.25"paired apertures. The WAVECAL lamp has a fairly constant output, sothat these data are a secondary monitor of any changes in the FOSinternal sensitivity. For the y-base calibration we will obtain aper-ture maps to determine the locations of spectra and the corse aperturelocation for the 0.3" aperture for all grating settings. We will thenmeasure the location of spectra for all the remaining science aperturesusing only the G190H or G400H gratings. Since we know that the FOSmechanisms are reasonably well aligned, the small number of observat-ions should suffice and the difference in the location of the spectrashould be solely due to the single versus the paired apertures. Theprogram can be scheduled as an interleaver observation and should berepeated every month for a total of 12 times. It is necessary to cond-uct this test many times during the cycle since we know from previouscycles that the location of the spectra has changed with time. Totalspacecraft time is 96 orbits of NON-PRIME time and 1 orbit of PRIMEtime.
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