FGS1r, FGS2r, and FGS3 Pre-SM4 Performance

Details FGS1r, FGS2r, and FGS3 Pre-SM4 Performance FGS1r, FGS2r, and FGS3 Pre-SM4 Performance

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007hst..prop11462n&link_type=abstract

HST Proposal ID #11462. Cycle 16

Astronomy and Astrophysics

Astronomy

Scientific paper

This proposal is the first of a pair of proposals that monitors the characteristics of HST's two "continuining" Fine Guidance Sensors across the boundary of the servicing mission SM4. This proposal obtains the pre-SM4 measurements. Proposal 11463 gathers the same data but for the post-SM4 baseline. For each FGS, stars from a selected field in the standard astrometric Galactic cluster M35 are observed in Position mode. This provides a measurement of their relative positions, which in turn provides an effective means to detect and monitor any changes in the FGS optical distortions and plate scales.If out of tolerance,the need for a re-calibration of the particular FGS's distortions will be indicated. The FGS-FGS alignments will also be monitored across the SM boundary. This will be done by using the same guide star pairs in the corrresponding proposal 11463. Finally, this proposal and 11463 include Transfer mode observations of selected M35 stars. These observations will obtain S-curves at the center and at two off-center field points in each FGS FOV. These data will provide insight as to whether or not the relative alignment of the FGS optical train with the HST OTA has changed. If changes larger than tolerance are observed, it will be necessary to activate the appropriate contingency proposal that will obtain S-curves are several locations in the FGS FOV to facilitate a re-computataion of the optimal values of K-factors that are used in the acquisition and tracking of guide stars and astrometry targets. This proposal requires a total of 4 HST orbit to support ther FGS2r and FGS3 observations. The FGS1r observations are available from the FGS Cycle 16 Astrometry calibration plan.;

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