Calibrating FGS1r's TRANSFER Mode Scale

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Hst Proposal Id #8835

Scientific paper

This Proposal calibrates FGS1r Transfer Mode "plate scale" along the x, y axis. Special testing during the commissioning of FGS1r in early cycle 7 revealed that this instrument's Koesters Prisms are not perfectly aligned w.r.t. the polarizing beam splitter and w.r.t one another. This introduces an affect whereby the measured separation and position angle of the stars in a binary system is slightly HST ORIENT dependent. This proposal will gather the data needed to determine the Koesters prism roll error so that this effect can be calibrated and eliminated from the science data during post observation data analysis.

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