Long Term Monitoring of FGS1r in Position Mode

Details Long Term Monitoring of FGS1r in Position Mode Long Term Monitoring of FGS1r in Position Mode

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10386n&link_type=abstract

HST Proposal ID #10386

Computer Science

Performance

Hst Proposal Id #10386

Scientific paper

It is known from our experience with FGS3, and later with FGS1r, that an FGS on orbit experiences long term evolution, presumably due to disorption of water from the instrument's graphite epoxy composits. This manifests principly as a change in the plate scale and secondarily as a change in the geometric distortions. These effects are well modeled by adjustments to the rhoA and kA parameters which are used to transform the star selector servo angles into FGS {x, y} detector space coordinates. By observing the relative positions of selected stars in a standard cluster at a fixed telescope pointing and orientation, the evolution of rhoA and kA can be monitored and calibrated to preserve the astrometric performance of FGS1r.

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