WFC3 SMOV Proposal 11445 - IR Geometric Distortion Calibration

Details WFC3 SMOV Proposal 11445 - IR Geometric Distortion Calibration WFC3 SMOV Proposal 11445 - IR Geometric Distortion Calibration

Nov 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009wfc..rept...34k&link_type=abstract

Instrument Science Report WFC3 2009-34, 16 pages

Astronomy and Astrophysics

Astronomy

Hubble Space Telescope, Hst, Space Telescope Science Institute, Wide Field Camera 3, Wfc3

Scientific paper

The goal of WFC3 SMOV program 11445 is to obtain a coordinate system free of distortion to a precision level of 0.2 pixels or ~ 26 mas. The astrometric calibration of WFC3/IR is based on two astrometric standard fields: a reference frame in the globular cluster 47 Tuc and in the Large Magellanic Cloud. Both 47 Tuc and the Large Magellanic Cloud, observed with the F160W filter and with dither patterns, have been used to determine the geometric distortion in WFC3/IR. We used a 4th order polynomial model to derive the geometric distortion in the IR channel relative to the distortion free coordinates of our astrometric fields. As a result, the geometric distortion can be successfully corrected down to the precision level of 8 mas, which is three times better than the required precision.

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