What Is New For WFC3 Astrometric Calibration?

Details What Is New For WFC3 Astrometric Calibration? What Is New For WFC3 Astrometric Calibration?

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21833105k&link_type=abstract

American Astronomical Society, AAS Meeting #218, #331.05; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

Already two years on orbit, the status of geometric distortion for the HST WFC3 camera is continuously updated along the following lines: 1)extending of astrometric calibration to additional UVIS and IR filters; 2) improving of accuracy for absolute astrometry; 3) implementing of filter-dependency in geometric distortion for additional reference files (DGEO) to be used in the STScI Multidrizzle software 4) monitoring the variations of skew parameter such as non-perpendicularity of the coordinate axes. Our goal is to establish a single WFC3 geometric distortion parameter, which can reliably characterize the stability of WFC3 over time, HST roll-angle, and scale changes from filter to filter.

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