Astrometric Centroiding for Saturated Stars

Details Astrometric Centroiding for Saturated Stars Astrometric Centroiding for Saturated Stars

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007hst..prop11509g&link_type=abstract

HST Proposal ID #11509. Cycle 16

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Scientific paper

This is a WFPC2 program that will calibrate the use of diffraction spikes to centroid saturated stellar images. The purpose is to provide an astrometric calibration of this method, which has been used for a series of HST observations of Sirius and its companion, Sirius being so bright that it is saturated in the shortest possible WFPC2 exposures. We will obtain both unsaturated and saturated images of 109 Vir, a star of type A0 V whose color is very similar to that of Sirius, but it is more than 5 mag fainter. This will allow a direct calibration of any offsets between the centroid indicated by the diffraction spikes or other PSF features and the true stellar centroid.;

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