WFC3 SMOV Proposal 11444 - UVIS Geometric Distortion Calibration

Details WFC3 SMOV Proposal 11444 - UVIS Geometric Distortion Calibration WFC3 SMOV Proposal 11444 - UVIS Geometric Distortion Calibration

Publishing date

Nov 2009

URL

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009wfc..rept...33k&link_type=abstract

Journals

Instrument Science Report WFC3 2009-33, 22 pages

Science

Astronomy and Astrophysics

Field

Astronomy

Additional info 3

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

Type

Scientific paper

Abstract

The goal of the WFC3 SMOV4 astrometric calibration program -11444 is to obtain a coordinate system free of distortion to a precision level of 0.2 pixels or ~ 8 mas. The astrometric calibration of WFC3/UVIS 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 F606W filter and with different dither patterns, have been used to determine the geometric distortion in WFC3/UVIS. We used a 4th-order polynomial model to derive the geometric distortion in the UVIS 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 2 mas, which is four times better than the required precision.

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