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 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.8897n&link_type=abstract

HST Proposal ID #8897

Astronomy and Astrophysics

Astronomy

Hst Proposal Id #8897

Scientific paper

It is well known for our experience with FGS3, and later with FGS1r, that an FGS 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 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 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 integrity of the FGS.

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