Verifying the Enhanced FGS Transfer Mode Flight Software

Details Verifying the Enhanced FGS Transfer Mode Flight Software Verifying the Enhanced FGS Transfer Mode Flight Software

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8890n&link_type=abstract

HST Proposal ID #8890

Computer Science

Hst Proposal Id #8890

Scientific paper

This proposal gathers the data needed to evaluate and verify the enhanced FGS Transfer mode flight software. The FSW that controls the FGS while it scans a target during a Transfer mode observation has been enhanced {via a modified #59 command} to cause the object's S-curves {x and y axis} to both occur very near the center of the scan path. The will compensate for the coarse track to fine lock bias, which until now has forced observers to use long scans, on the order of 1.5", to assure that both the x and y axis S-curves and are fully sampled. With well centered S-curves, shorter, less time comsuming scans can be used. This allows for more scans to be made, resulting in higher S/N and more accurate scientific measurements. This is especially important for high angular resolution FGS observations of objects fainter than V = 14, as will be demonstrated by exposure #70 which scans a V=15.5 star. This test will verify that the FSW performs as desired. It will also allow us to measure any change in the S-curve morphology and amplitude that may arise from using an altered scan path. The data from this test will be compared to data from a baseline test gathered by visit 01 of AST/CAL proposal 8833. The FSW enhancement has been implemented for all 3 FGSs, however this proposal tests only FGS1r. FGS2r will be implicitly tested when the new FSW is used during a routine long term monitoring proposal.

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