Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008hst..prop11463n&link_type=abstract
HST Proposal ID #11463. Cycle 17
Astronomy and Astrophysics
Astronomy
Scientific paper
This proposal is the second of a pair of proposals that monitors the characteristics of HST's two "continuining" Fine Guidance Sensors across the boundary of SM4. This proposal obtains the post-SM4 measurements. Proposal 11462 gathers the same data but for the pre-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 the means to detect and monitor any changes in the FGS optical distortion and plate scale across the SM4 boundary, and if out of tolerance, will indicate the need for a re-calibration of the particular FGS's distortions. In addition, 11462 and this proposal include Transfer mode observations of M35 stars to obtain S-curves at the center and 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 at several locations in the affected FGS FOV. These data will be used to re-compute the optimal values K-factors that are used in the acquisition and tracking of guide stars {and astrometry targets}. This proposal lists 12 1-orbit visits to allow for any of the three FGSs to be removed from HST in SM4, and for SM4 to ocurr anytime between August 2008 and April 2009. However, only four of the visits will actually execute.;
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