Mapping the Position Dependence of the WFPC PSF - Verification

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Hst Proposal Id #4161

Scientific paper

We propose to obtain observations of a bright star at 25 different field locations (a 5 x 5 grid) in WF2, and at 16 different locations (4 x 4 grid) in PC6. These observations will be taken in filters F555W and F785LP (so far the most widely used filters) and will have multiple exposures per readout. The principal aim of this set will be the calibration of the position dependence of the magnitude zero point for photometry. We will also observe (in PC only) through the F487N and F889N filters: this will provide a much needed data set against which to compare the theoretical PSF models. We also plan to take observations in a variety of other filters at 4 locations (2 x 2 grid) in P6, to support recent planetary observations.

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