Calibration of the Geometric Distortion of ACS

Details Calibration of the Geometric Distortion of ACS Calibration of the Geometric Distortion of ACS

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9443k&link_type=abstract

HST Proposal ID #9443

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Hst Proposal Id #9443

Scientific paper

We propose to calibrate the geometric distortion of the WFC and HRC of ACS, using the state-of-the-art techniques that we have developed for WFPC2. We are confident that we can measure the distortion to at least an order or magnitude higher accuracy than is called for in the ACS Manual. We will use the images that are to be taken in GO-9028 and will re- image the field used there at different orientation and through different filters, so as to improve knowledge of the skewness of the field and the dependence of distortion on wavelength. Our results will not only enhance the accuracy of our own proposed proper-motion work in star clusters; they will greatly increase the accuracy of sparse-field astrometry by others, such as solar-sytem and extragalactic work.

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